Though the details are still shrouded in flash glare--or cropped out of the photo entirely, Pish Posh Baby has the scoop from ABC Kids Expo in Las Vegas, where Uppababy debuted a poster of a removable underseat seat for their flagship stroller, the Vista. The RumbleSeat allows you to stack your kids Phil & Teds-style, only they're facing toward you, so it's totally different.
Uppababy also announced a foldaway buggy board called the piggyBack [not the PiggyBack?], which looks like a little skate deck; it's even made of wood. Check PPB's photos and stay tuned for details.
The All New 2009 Uppa Baby Vista Stroller with Rumble Seat and Piggy Back [pishposhbaby]
Nothing yet on Uppababy's Vista site [uppababy.com]
a real life photo of the RumbleSeat from Mommieswithstyle's photostream [flickr, thanks sharon]