Overall I like the change to LFG. Adding the feature to mark tank, healer, and DPS does two great things. First, it means no more asking hybrids if they want to tank or heal when they're all DPS and too lazy to put their spec in comment. Second, Blizzard finally tells people what the roles are. Hopefully that will help new players.
The only bad thing so far is the group/individual split. Why are they divided? It just means more clicking to see everyone. If the lists are too long, then let us filter by group or individual.
P.S. The Secret of Ulduar is not Yogg-Saron. Is he a secret? No. The secret is... don't tell anyone... it's Kael'thas.