Not sure if this has been asked, of there is a thread with a proper on topic discussion so i please ask moderators to close if there's a similar thread.
I would guess that with the complexity of the game, especially AI going forward, and now with CPU PhysX acceleration BIS will probably make the engine use more cores than present RV3. There are 6 and 8 cores from AMD and 4 core (8 threads) and 6 core (12 threads) from Intel.
1. Will Arma 3 will go further and use more than 4 cores?
2. Will Arma 3 make use of SMT?
I bet Suma is working on it....