apologies for the late reply. The outcomes of this old conversation is that Bela's analog inputs have troubles (poor signal quality, resulting in occasionally corrupted data) on the BBGW. The audio channels seem to work ok. However, all the above is with the wireless module disabled. The pin conflict, as mentioned in that conversation, is that the wireless module is using some of the pins in use by the Bela cape.
In other words, the cape is partially working (noisy analog inputs) when the wireless functionalities of the BBGW are disabled, but if the wireless functionalities are turned on, then the Bela cape cannot work.
This means that if you have a BBGW laying around and you want to use it with a Bela cape, you can do so, perhaps accepting a sample rate reduction on the analog inputs, by getting rid of the transient noise with median filtering. However, the wireless functionalities will have to be disabled. For these reasons, we wouldn't encourage to buy a BBGW specifically to use with the Bela cape.