I'm not keeping track of all the videos, so I'm not sure if it is demoed somewhere (I'm sure somebody will be able to help out), but it works essentially the same way as the iPhone keyboard:

http://www.youtube.com/watch?v=DNgGudVXgzI (at 0:30 the "tap and slide" is demoed). The other features are pretty similar as well, only that the predictive word replacing is not automatic by default (instead you either tap the bubble with the suggested word, or click on a misspelled word to get a list of suggestions). You can make it automatic as well though, in which case space will insert the predicted word.

While searching for this demonstration I also found out about this trick, which works as well:

http://www.youtube.com/watch?v=QOr4B7B5A8Y

So yeah, it's very close to the iPhone keyboard, with nice haptic feedback, great responsiveness, and some additional tricks (like swiping to change input language/method).