It's about a day old, which means no chance at getting a question answered now. The good news is a lot of questions did get answered that are worth checking out.
For instance, those of us with last year's Moto X, there's no "official" confirmation that we're getting Android L. But it does have "plenty of life left". Which was the subtle way of saying "yes, you are getting Android L".
It goes really in depth though to the new Moto X specifically, but touches on some of the other devices. The Moto G gets an explanation as to why the screen size is bigger but the specs are pretty much the same as last year. Things like that.
Overall, pretty informative AMA and one anyone with even a remote interest in the Moto X should check out.
Oh yeah, I kind of forgot to mention it the other day but the new Moto X will let you be able to set the wake up command to whatever you want. No more "Ok Google Now". You want to say "Wake up, Hal 9000" you can do that. "Hello Jarvis"? That'll work too. And so on and so forth.