A "hub and spoke" raid of 6-10 bosses.. Minimal but challenging trash leading to 2-4 bossfights pr. "spoke".
More fights requiring awareness and class abilities instead of hard dps checks and simple tank swaps.
This is a slippery slope for me as I DO NOT want to see the Op leader/guild being FORCE to take a crtain advance class., saying that i don't mind them having an encounter that require a certain role e.g. a RDPS/MDPS; where this is already being use in NM EC with the exploding add's at the tank.
Also, I like to see some kind of legendary drop now., perhaps a drop from the final boss in a 8-10 bosses op