Not going to believe this unless I'll see a federation protocol (or at least official promise of such), so I could possess and host my own identity (not Google Account) hosted on my own physical server, possibly integrated with my own services (XMPP, email) and communicate with G+. Maybe I've not looked much (I've just Googled a bit and had no results) and there's some? For now, G+ is just another Facebook. With a mi…
It doesn't exist yet. But Google's history of trying to adopt federation and with open source in general give me hope that that's part of the plan.
I guess it seems to me like, from their perspective, their previous two attempts, Wave and Buzz, failed at a user experience level, and so never achieved wide adoption. With +, it looks like they're trying to really nail the user experience first. Which strikes me as a plausible strategy.