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.
If I'm reading correctly, you're going to get the BA4 beforehand? That would be nice so I can see your impressions on it before I pull the trigger.