I've seen that actually, while it's cool and I really hope it matures right, it doesn't yet support RTK (software isn't done) and while I expect them to complete it, I still don't have a way to tie that in with the camera photos, or at least not at any better accuracy (due to using the granularity of the camera timestamp).
A follow up question, is does anyone know the protocol for the hotshoe, for feeding GPS data?