Just had a thought... (and this is pure speculation here) what if this max level raid was like a shortened instance akin to what Blizzard does for those dungeons for various holiday events (Coren Direbrew for Brewfest, Ahune for Midsummer Fire Festival, etc.).
You would still zone into a MC that's been updated with max level mobs and bosses but there would only be a few bosses to do (i.e. something like Gehennas, Garr and Ragnaros since they are close together).
Just a thought...