I think that it's just a gimmick.
Anything thicker than few mm will obstruct view filed of the camera. And honestly, of all those ideas so far the only thing I find useful is a bigger battery but that also depends of the thicknes of the device as it is. HWK should be at least 6-7 mm thick to be comfortable to hold and what about the hole for the camera. Do we want a keyboard with a hole?
I don't expect anything from TOH and I realy don't care about it.