Well, there are some changelogs on garage with some interesting entries (namely some patches related to kinetic scrolling). We should be getting some fairly significant upgrades with Diablo (moving from an early alpha of Gecko 1.9 to one of the new beta releases will net us major performance boosts).

timeless (the MicroB architect) has a "blog" somewhere where he covers GUI designs for a good cookie manager. Not sure if this is something we'll see with Diablo, but it's presumably coming at some point.

Peet, as Dolske said, that page really has nothing at all to do with MicroB.