Is it stock? Does it preserve your info/apps?
It's the leak from the keynote. It's stock. The only thing the dev is doing in that thread is optimizing it and fixing it up to work the best way possible and IMO it is the best of the JB ROMs floating around at the moment. Works fantastic and is updated daily or so.
Super fast performance and everything is working.
When you log in, I haven't chosen for it to restore my apps, instead I just go down the list and manually reinstall so I am not sure if it will restore apps automatically or not, however, contacts, info etc etc from Google cloud? All good to go.
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Battery life for Jelly Bean, for me, seems to be pretty on par with ICS so far from my experience. I think there is a lot of 'playing around more than usual' stuff going around.
As a side note, I am still on Jelly Belly 1.6 (It's at 1.8 as of now, just haven't had time to update it), and my GPS has been working fine. Took a few moments to lock on with voice navigation however my wife and I used it fine over the weekend for directions - worked like a champ. As I said, easily a daily driver and I used no mods or fixes on top of the normal ROM installation.
IMO it is the best JB ROM going at the moment.....Until Google releases source and AOKP gets their hands on it that is!