Well, I'm definitely not buying the ipad version just to support Battlefront. I would be buying it because I love Combat Mission and I want to be able to play a version of it on the go.
I have an Ipad 1 that does everything I ever wanted it to do for me up until CM; touch came out.
I have an Iphone 4S that is almost identical in power to the Ipad 2. I would run CM: touch just fine if Battlefront would release the game for it.
If I can type on that touch screen, I could undoubtedly play CM on it. Zoom in to give orders, zoom out to view the battlefield. It's WEGO with turns, not realtime, so it would work out fine.
I have no desire to buy a new Ipad anytime soon, so an Iphone version makes sense. Please, Battlefront, make it happen.