Icecrown: Rated Battlegrounds
Given that custom features will at least be considered, I have a recommendation that I think will exponentially increase player experience on Icecrown.
Currently, due to the expansion of Icecrown, there are no Rated BGs (which were implemented in Cataclysm). This need not be the case! Rated BGs will take PvP to another level on Icecrown, and it will be at the cost of no person.
The first benefit for Icecrown will be more PvP activity, particularly from those of us (me included) that are tired of farming low geared players over and over again in Random Battlegrounds. Rated PvP will give us another reason to come back.
The second benefit is, it will push guild rivalries much further, making PvP much more exciting once again.
Finally, with high geared players supposedly playing Rated Battlegrounds, the Random Battleground queue can become more balanced, and will allow low geared players to both have fun, and get gear faster.
This option will of course merely give players the possibility to play the new bracket, rather than forcing anything on anyone, so it will not harm what the current players are doing.
Rewards can be chosen by staff, although I think the beating a rival guild is sufficient reward itself as well.
Hope Warmane considers this for the future!