with all due respect please try to find a better argument because the 'always listening' option can be disabled. And for what it's worth it only works with the US English language. With that said, the battery drain isn't really an issue for other Nexus devices.
If you dislike the new launcher, well that's your personal opinion. My opinion is that Google should let Nexus users decide what launcher they want to use, without the need of side-loading it. I think this move is disrespectful to other Nexus users. Arguing that they want to see how people react to the new launcher on the Nexus 5 is IMHO complete nonsense. I had another word in mind but will try to keep my language politically correct.
One of the reasons for buying a Nexus device is the 'guarantee' of timely updates, without (until now) the fragmentation and differentiation of devices that affects other brands.
Now Google is tearing apart the Nexus family and that sucks.
Why make the launcher specific to the Nexus 5? Don't tell me that the Nexus 4 can't handle it. The hardware specs are more than enough for anything that I've tried to run.
It sounds like Google is trying to change Nexus 'concept' to something that I really don't like. A mean money-making machine.
Please Google, get your act together. As other people said we already suffered from many problems, specially us Nexus 4 owners. Very poor logistics, low quality screens on specific production series and some very fragile devices (poorly built/poor QC) are just a few to mention.
Now please don't let us down with a cut down update to Kit Kat.