Just got an anon tip that a big G+ refresh is going to be announced tomorrow.
I've had 0 prior interaction with the tipster, so it could be totally false, but there's definitely been a new web G+ in testing which is more material and very much redesigned. I've seen it.
But just because it's been floating around doesn't mean it's actually launching tomorrow. If the tipster is right, however, maybe we'll see it. Hit us up via http://www.androidpolice.com/contact
if you know more.Edit
: Starting to look legit. I think it's happening.