If you haven't heard about it already, here is the blue post that explains the intended changes to raid buffing. Basically, they will allow buffs to extend to the entire raid, whether it be 25- or 10-man. This gives more flexibility and allows you to choose from any and every class-type for raid make-up. It also means that you don't have to juggle groups around depending on the fight, but can leave them intact throughout the instance.
There have been a lot of gear updates over the weekend for WotLK instances. As more people hit level 80, more loot in the end-game instances will be uncovered.
Wowhead hasn't been updated with a lot of these items, but check back over the course of this week to see what has been added:
The Eye of Eternity
Halls of Lightning
Caverns of Time
Unfortunately, Naxxramas has yet to be updated. However, check out this placeholder weapon. :o
I get ever closer to getting back into the game.
Gaiwyn of Proudmoore