There was an update in a DLive thread shortly after the latest firmware update (which included new wireless integrations, but not for the EW-DX system). Apparently Sennheiser has been changing the underlying protocol and is supposed to release a “finalized” version shortly. A&H has been holding off on any integration until the underlying protocol was finalized and not likely to change. I completely understand their view on this as there is no need to waste resources working on an update that you know will shortly break with a new protocol update.
That being said, I have no idea when the protocol will be released and/or when A&H will finally get the updates into their consoles.