This one looks promising. I was a huge fan of Sid Meier's Gettysburg back in the day. The spiritual successor to that was the Take Command series followed by Scourge of War. I never quite enjoyed these games as much, the ai never really seemed much of a challenge.
I have watched a few vids of Ultimate General and think it is a bit too 'arcadey' for my taste.
I'll be keeping an eye on this one. The command and movement graphics look a bit clunky at the moment so hopefully that will improve.