Seriously awesome idea!
Yeah, I was all hyped up for Cataclysm 6 months ago when I decided to take a 6 month absence from new stuff, so I'm really foaming at the mouth for it now. I'm a HUGE Ultimate fan and I don't want to see it end. More importantly, I don't want to see Reed die. Good, bad, whatever, the guy is interesting. First issue went fast, but fun. I had to read the 0.1 spoilers on Marvel Wiki since MU didn't have it uploaded. I was expecting more from Infinity. The Avengers and all the space empires vs an unstoppable force... er... nevermind. Thor killed one of them and now they're all going down like a pack of sweet muffins. Seriously? All that build up to make the builders look awesome and they're beaten in one issue (or at least seemingly beaten).
I read Longshot saves the Marvel Universe #1 today. Its really peaked my interest. Its mini-series like this, that makes subscribing to MU worth it. I'd never make room in my budget to buy this comic, but I'd totally read it if it was available to me digitally.