|Ulduar hard||226||Ulduar, KT/EoE|
- 10-man normal (232) < 10-man hard (245) = 25-man normal (245) < 25-man hard (258)
Others (such as 10n < 25n < 10h = 25h) are logically possible, but to me, that's the most likely distribution that leads to three different ilvls. It's also the way Ulduar is done with normal and hard modes, apart from some differences in weapon ilvl.
Crusader's Coliseum on heroic is a bit different than Ulduar hard modes, though. It seems that when you do a heroic CC raid, you start out with a certain number of attempts (wipes), and the more attempts you have remaining upon defeating the final boss, the better loot you get. So will ilvl 258 gear be contingent upon beating CC-heroic in (say) fewer than half your attempts? I guess we'll have to wait and find out.
Of course, the really important question is: what the heck will we call the 3 different sets? T9.0, T9.33, T9.66?
Patch 3.2 will bring about a new 5, 10, and 25 man instance to WoW, and usher in a new 40-man battleground called the Isle of Conquest. WoW.com will have you covered every step of the way, from extensive PTR coverage through the official live release. Check out WoW.com's Guide to Patch 3.2 for all the latest!