Battery life is estimated to be around 6 hours and it will weigh 400 grams. Edit: I also just got a hint that not all of the specs are correct, so I wouldn't rely on them.
I'm a little surprised to see this tablet, but not by much I'd already gotten a hint a few days back that Kobo would be releasing this tablet, and that the FCC paperwork was just a convenience, not a sign that they had passed on the tablet.
But I'm also not surprised to see this because I know that Kobo have been working on an Android tablet for at least a year now. In fact, I have a photo from last October of what might be the Kobo Vox. It was called the Kobo Color back then but it's basically the same tablet.
Given that they have been working on it for over a year, I'm hoping against hope that the Vox will have the enhanced Kobo app that can be found on the HTC Flyer. That app is incredibly sophisticated and does a lot more in terms of annotation than any of the other mainstream reading apps.
Here's a video, in case you're interested: