So, what do you guys think?
I think he will/should be there, he is a massive lore figure in this expanion (if you played wc3:tft you would know).. And is not justified by being a 5 man instance boss, and the final boss of a "filler" raid between Ulduar and ICC.
Anub' Arak, imo, will almost definately be ressed by Arthas, and will be a boss.