On the topic of a hypothetical "Mobius 2" (or similar product), in addition to my
prior comments I did a little research on the problem of transmitting 5.1 audio wirelessly, and discovered a reference to
Enhanced aptX. This apparently little-used subtype of aptX encodes 5.1 audio at a bitrate of 1024 Kbps, theoretically within Bluetooth's effective limit of ~2.1 Mbps. Qualcomm doesn't seem to market or offer any products that support it, but I have to imagine they acquired the rights to it along with the rest of the aptX IP.
Perhaps if the Mobius does well enough, could we see something implementing 3D spatialization wirelessly via 5.1 audio over BT in the future? Audeze would for sure need to bundle the headphone with a specialized USB adapter, since nothing else supports Enhanced aptX. Coupled with a low-bandwidth mic return channel and you've got your near perfect super gaming headset.
No idea if this is at all feasible - just throwing the idea out there. Would definitely make for a compelling product though.