@peter I ordered an A-06 version of this back in October. Here's to hoping it ships sooner rather than later.
That said, please post about your experience using the CM4 variant, as I think your system will have better driver support than the A-06 variant. I was honestly torn between the two, but if they ever go about releasing a CM5, I'll probably buy an adapter and upgrade at that point.
@leimon Hopefully your's shouldn't be long then as I ordered this one in October.
So far it's been pretty good, still not got 4G mobile working yet and playing with the wifi as it seems the internal antenna (on the CM4) is working better than the external one - about to take it apart to check that at the moment