I will be getting a BA4. Nothing at all wrong with my HY3, I am getting a BA4 precisely because I love the HY3 so much, and want to try one of Cosmic Ears full BA setups
Current estimates from CE seem to be that the full range will be available for general order from around the tail end of March, when the new cables are in full supply.
They are apparently also waiting for a new low/high mids driver unit, that won't be available from the manufacturer until April! I'll rock my MA2's untill then :)