I'm gonna say that this is "BF3". I don't see EA putting out a free Battlefield game and then devoting resources to put out a $50 Battlefield game to compete with it. What would be the purpose to split your fanbase between two games in the same series and who would pay for a game instead of going the free route? The online model makes sense since it will be easier to update and expand because, in the past, the expansion packs for Battlefield games have been a bust. However, I shudder at the part about making the game simpler (dumbing down?) and paying for more accuracy. Sounds like they are taking the skill out of the game.
I do find it interesting they went with the cartoon route a-la TF2.
Battlefield Heroes website
Battlefield Heroes press release