I don't know for sure.. but I think a 10 box for MoP is going to be Op with 5x resto druids and 5x Locks.
5x resto druids means you have SO much healing, and unlimited DPS.. You can outlast any other group of 10, and you don't have any downtime in DPS or healing.

10x BREZ (druid brez can be instant, if talented)
10x Dots (omg so many dots... just dot everything and run around like an idiot for /profit)
10x Hots (warlocks get rejuv when paired with a druid (symbiosis)
10x Demonic circle: teleport (druids get this with symbiosis)

the list goes on..

5x druids with the right 5x melee will also be amazing... or 5x druid and 5x mage for 10x mirror images? yes please...