If they hadn't lost me at HTML5 (the next big hype joke) they lost me at web based IDE.
Frankly, we could use some good HTML5 game engines. Making a game on HTML5 is a nightmare right now, with all the different hacks needed to make sure it works on all browsers and platforms at a semi-decent speed (at least until the next android/ios upgrade). Having a single engine/framework to wrap it all away would be nice.
There are a few rudimentary out there already, but still too early to be viable IMHO.
EDIT: looked at the samples and eh.. basic? really?