lol nice ideas so far, I like the ideas from krasgoth but I think combined it would be a real keyboard smasher.
I like alot of the insta-gib stuff. makes people perform well and consistantly (or you drop them) Mimrons shock blast forcing people out of the way, Generals blast that needs to be inturrupted.
Alot of random-ness which each member needs to avoid - perform to do their best.
Although fights where RNG works massivly against you is hard to design/tune to
(I remember our first few times in 25 ICC people thought Marrowgar was impossible untill we realised we kept getting 2-3 healers spiked every time, lol. this is workable with communication, but to meny of these random elements would make a fight very hard - but then again in cata they already said they will remove limited attempts /cheer.
Random aggro is an excellent leveler possibly even easier to do in cata with all health pools larger, possibly with the Idea that the tanks need to rotate taunts for attacks that will insta-gib raid members (possibly making intervene to good?)