Sim Engine II advertised on Sonalyst's website looks very interesting and intriguing, but it is my take that its future development and application will be rather in commercial offerings and not hard core PC combat simulation like sequel to DW. Logically, this has to do with potential, viable gains such a commercial undertaking may bring to Sonalyst.
On the other hand gaming audience is clearly targeted by Rear Impact and it serves as a demonstration of new features and global capabilities of this new SE II engine.
This is my take and I do not think ATM anything as involved as DW#2 is in the works
On the other hand, no need to add, I wish to be wrong!