I would like to post a super low-end (and marginal workaround) for the problem, at least just for practicing around the house... I have a simple little setup just for tinkering and wanted to go wireless for heaphones..
I have the G10 for wireless guitar but the headphones are the problem.
I have a nifty bluetooth transmitter and low latency supported heaphones.. but I had the latency problems like everyone else. It was an interesting experiment playing with the delay... It was shocking how hard it was..
I dont have the money to get a real solution.. but I have a lot of gadgets laying around.. I was able to utilize an FM transmitter and a tiny Sansa Sport MP3 player (which has FM). It gets me mobile and I can wear my headphones of choice. The biggest problem with this kind of thing is that the FM transmitters are susceptible to interference.. but my rig isnt going anywhere.. I was able to find the 'sweet spot' for the transmitter to get the best possible signal.. (noise is always going to be there.. and if you can get it down to a level that can be ignored, you can be relatively happy with such a setup).
If you have the parts around to try such a setup you might give it a try.