Since i don't think challenge modes have taken off like blizzard wanted them to, what about implementing 5 man raids. What im talking about is, dungeons on the scale of brd and dire maul but harder then cata heroics at launch. Basically as hard or harder then challenge modes with no timer and rewarding lfr quality loot. 1 new 5 man raid released each tier along side the real raids, and this would replace dungeons added after an xpac launch. they would be max level content only and reward something like 100 valor per week for completion or something.
Anyways its just an idea, so what do you think?