Seriously? the Close Combat successor is the Bloody First.
You'd think that, but you'd be surprised. I've got a write-up of Close Combat to do as well which will provide some context.
That's not to say The Bloody First isn't good - It is, and I enjoyed my time with it. It's got a few issues to sort out but nothing major.
Armored Brigade represents a genuine evolution of 2D Close Combat - thus a 'successor' to the legacy those games created. 3D Close Combat is indeed a CC game, but the move to 3D means that it'll be able to start doing a lot more things that 2D CC can't do, and I reckon after a few iterations it'll end up being quite different to what classic Close Combat. That's a good thing, and both can exist as heirs to CC's throne, just for different reasons.
Think the successor kingdoms to Alexander the Great's empire.