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Well, I saw some of this coming, but not all of it. What do you all make of it? 
Tony Sandoval (Big Bear)'s profile photoKeith Pawson's profile photoBo, Dang Ren 柏當仁's profile photoNeal McBurnett's profile photo
Bravo for big ideas, and videos of the OS look like it's really pretty great. But there's no way this will impact a market that's being swallowed whole by Android. It would need to be adopted wholesale by a big OEM that doesn't want to play with Android or Win 8. Has not happened with PCs, not sure how it would happen with phones. Not to mention the patent trolls are sharpening their lawyers, er, I mean, spears.
I saw all the videos and read a little bit, the most important feature to me is the ability to manage the devices from Ubuntu Landscape.
My first three responses:
More choice / competition is good. 
Ubuntu is pretty good, too. 
Doubtful that it will sway me from Android, aside from experimentation.
Rather weak from the developers perspective. The SDK is QML which is small subset of Qt which is small subset of C++ which is small subset of modern development universe. The lesson from meteoric rise of Android is to target rich existing dev community (java in that case).
The problem is Ubuntu will be another silo.  What we need is a standard architecture for the hardware.  I should be able to buy a phone, and run whatever OS I like on it, regardless of the manufacturer.  
What do I make of it?  (1)  Canonical is starting after Windows Phone 8 has been rolled out, and of course long after Android and IOS have been established, so it is very late to the party.    (2) Microsoft has way more marketing budget than Canonical, which is important both for attracting end users and application writers, and which is very important when you are trying to overcome the aforementioned last-mover disadvantage.   (3)  RIM, Microsoft, Samsung, Apple, etc. all have way more experience negotiating with carriers, which is critically important in the US market (it's unfortunate that the carriers have that much power, but it's true).   (4) Canonical has relatively little experience with negotiating with handset manufacturers.

What could go wrong?
I have the same reaction to this as I had to Mozilla announcing Firefox as an OS--I think it's a grand idea, but I would like to know where they think they're going to find hardware vendors to partner with.  Unless an awful lot of users start owning their own devices outright, it's hard to see where the market is going to come from.
I'm skeptical, but I know I'll buy one.  That, or they'll probably release an image for the Galaxy Nexus, and I know I'll flash mine.  It will be interesting, and, just like with Windows Phone 7, I'll reserve judgement until I get my paws on it.  I expect the first release to be buggy and I expect issues with it, actually, but that's the price you always pay as an early adopter (remember iOS originally didn't have video recording, or cut and paste?  The Nokia N900 shipped without MMS support, too).  I'm more interested in an Ubuntu tablet than an Ubuntu phone, honestly.
Great! Im excited. There is a development issue. It should somehow be able to run android apps, as I don't see it getting its own ecosystem.
The next gamechanger for phone is "openoffice just works, my desktop apps just work, it all ported trivially with some UI changes"

Ubuntu sounds like its missed the boat on these but we shall see
running Android apps would imply having Java VM and they specifically state not having one as one of their virtues..
Totally agree on eco system.
I can see someone building simpler sleeker Android but this is not it.
nothing (literally) to see here, move along. Linux plus UI does not equal successful smartphone. Unless this arrives with a feature set/app set equal to at least Android and way way cheaper its a non starter
I wonder why they spend so much time on Unity and how it is the up and coming wet dream of Linux Desktop and now announce something that unifies desktop and mobile - but not with Unity. And the fact that there are no devices, no carriers that have committed themselves and a new (thus empty) app ecosystem is created leaves me wondering about the vapourware factor of this. What does it mean for Ubuntu TV for example? Canonical leaves me confused. Lots of projects and shiny videos but I wonder - where's the beef?
I like this. More promissing player in the mobile market means more competition, which should lead to faster UI improvements. On the other hand, I am still waiting for a userland Ubuntu for Android, so I can run Ubuntu on my phone without rooting it.
Ask me again in a year. I'm not sure what to make of the new OS. I think it will present yet another challenge for app developers. I haven't read anything about app development for Ubuntu mobile so I have little to go on really... I don't know if this was the right move or not. No matter what, Ubuntu mobile already seems better than any version of the BlackBerry OS I've used.
No, it's still Unity. Indeed the end-game goal is to have one Ubuntu/one
Unity image that you can use to run your smartphone, tablet, desktop, or
Well, I have heard so many ideas and visions from SABDFL that I really would prefer some proper execution. Get me code, not apple ish video clips. ;-)
yes, the end goal is more Apple-esque than anything: one oS on all different devices.
As soon as canonical makes ubuntu on Android an installable apk, then I will go with it.
+Theodore Ts'o No, the catchphrase is "What could possibly go wrong?" Haven't you read your Swallows and Amazons?
Im not SUPER excited for this but since I have decided I am moving away from Windows completely I will try out the ubuntu phone stuff on my #Nexus4   that I just got 2 days ago when a stable release comes out.
The interface looks lovely. It's nice to see greater competition and better designs all around in the last several months. After getting a Galaxy Nexus with Jelly Bean, iOS just doesn't seem as impressive anymore.
I can't wait, this is great news and just what I was hoping would happen... thank you Canonical!
+Mikhail Garber QML actually uses JSish code for the glue. The libs can, of course, be written in anything you like and compiled.

+Ben Stinson This isn't Android. It's Ubuntu through and through. (Android's Linux kernel  is used, but that's not really relevant.)
Nice interface, great community, compelling vision.  Very tough in today's climate to open things up like this, but with Ubuntu for Android as a stepping stone (, and with the growing importance and power of mobile devices, this is clearly a good direction to head in.
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