A post on CNC Generals World has word on an "official EA survey" they believe gives indications on new directions being considered for Command & Conquer 4, the next installment in the RTS series. A subsequent post makes it clear that this is not 100% confirmed, but they are confident in the survey's veracity (thanks Ant and Planet Command & Conquer), and Shacknews has the link to the online survey itself. Here are the parts that have everybody speculating:

Play in the first RTS game with MMORPG like player progression in which you are rewarded every time you play. Every unit you kill in single player, multiplayer, or skirmish gives you experience points that allows you to level up your abilities and unlock new units, powers, and upgrades to your arsenal.

Introducing the first mobile base in RTS games: The Crawler. Focus on the action as the Crawler becomes your all-in-one base, which can be deployed and redeployed anywhere on the battlefield for even more strategic options

Play with all new, bigger and badder, units from GDI and Nod, including the Crawler, the first ever mobile base in RTS games

Dive into an all-new story written by a new scriptwriting team and told through trademark C&C cinematics taken to the next level with grittier, stylized FMVs in the vein of Minority Report.

Play in the first ever class-based C&C game – a new challenge for C&C and RTS players to master

Play the campaign on your own or tackle it with a friend, as co-operative campaigns return

Play in epic 5 vs 5 online multiplayer with all new objective-based game modes