Well, I mentioned my Ulduar idea to the raid last night, and everyone seemed pretty excited by the idea of finishing up Glory of the Ulduar Raider. I'm really looking forward to it. Ulduar was, in my opinion, the finest raid of the expansion, and we've actually got several people in the raid that didn't have a chance to experience it. The inflated health pools and DPS numbers from the ICC gear will really help take some of the stress out of things too. Steelbreaker is going to be hitting for a lot less on a tank with more health to soak it and will almost certainly die before the first tank blows up. Large health pools will mean we're less likely to get instantly blown up by lightbeams on Freya +3. And DPS through the roof means it will be much, much easier to kill Yogg before everyone goes crazy.
I'm honestly not sure if we'll be able to manage everything in the space of two weeks - the hardmodes were actually tuned pretty tightly and overgearing content only counts for so much. But I certainly think it's possible, and having a rusted proto to fly around on in Cataclysm would be really neat.