I think they made a good effort at it, and are up to version 1.08. I absolutely love the older Combat Mission games (working through them now) and have kept tabs on Battlefront.com forums. Everyone seems a little more satisfied now, but there are still a few problems.
They have an updated demo at version 1.07 that I tried the other day. It played just fine with no bugs, but there is a little something missing. Maybe it's just that I (like everyone else) love the tactics of WW2. I can still see myself picking it up in a compilation or value pack a year or two from now though.
They have also talked about using this engine (modified) for another WW2 game with "modules" like this Marines expansion pack for lots of different fronts. Hell, might as well just link to the thread if anyone cares:
http://www.battlefront.com/discuss/ultimatebb.php?ubb=get_topic;f=52;t=004118