They iterate heavily on PTRs so I wouldn't be suprised to see a ton more changes in coming weeks. For Ulduar, its very probable that there is 10-15 mins of trash between each boss, even 5-7 mins of trash between bosses means lust will be available by the time the next boss is 50% so not a raid nerf at all, except in the case of 25 man long boss fights. The shortening of the c/d to 5 mins means in 10 mans you will have it up more often after wipes.

And really lust is most useful when you are first downing bosses to get that extra oomph in, once things are on farm you don't even really need it anymore, it just makes the fight go by a little bit faster.

I'm really most suprised by some of the DK and pally nerfs, DKs seem to have gotten hit hard, especially with the aura and dual wield changes. We'll just have to wait and see how it plays out. Also really bummed that the profession changes are pretty crap right now, further reinforcing the idea that JC is the uber profession.