I'm not holding my breath, but I think that 4Sevens is going to release a headlamp soon. Chances are that it will have an XP-G R5.
Zebralight is releasing some new headlamps in mid-March. They will feature reflectors and XP-G LED's. They did not say what bin, though. I kept contacting them about the release date, and details of the emitter. They finally responded with some details, and an approximate release date.
I'd love to see an XPG in 1 watt RayoVac (the one with the luxeon main white beam, 2 red and 1 blue 5mm LEDs and the swinging diffuser). I use this all the time and can't imagine how bright it would be with an XPG