If I can get a hold of the RCON documentation from DICE, I might add BF3 support to PRISM. From what I have seen, it's going to be much more basic then the current power we have with the LFS packets.
Not sure if any other sim racing games have an interface like InSim in LFS, but it would be interesting to get some other sim racing games on it too if you're planning on adding BF3.
Anything to works on the TCP/IP or UDP/IP stack will work on with PRISM. We just have to set it up to make sure it understands the packets that are coming in. That's really all there is too it.
Unfortunately I haven't gone looking for the server package yet, but I'll see what I can dig up I believe that the rcon protocol hasn't changed, so that documentation should still be fine. But, I've not tested it so don't take that as gospel