A lot of people are writing up this video of the NYTimes Editor "leaking" the Apple Tablet (see 8:20 in the video) in this supposedly off record talk. But this isn't proof of anything.
It could easily just be that Bill Keller reads rumours, too. But what if that was a whoopsie letting loose a secret that Bill knows with first hand knowledge? So what? We already know it's coming, having talked to people who have seen and heard things first hand. And we do know the NYTimes is involved with the project. So that's just more of what we already know, but in a way that's not really more proof.