Update: To clarify, the Touchstone charger doesn't actually charge the Lumia 920. It just actives the charging protocol but due to a mismatch in frequencies, it does not actually do anything. In fact, as webOSNation's Derek Kessler tells us, it could even damage your phone were you to leave it on there for an extended period of time. In other words, don't do this!
The Nokia Lumia 920 (and 820 with backplate) uses the Qi standard for wireless charging. In simplest terms that means universal charging plates (as opposed to some proprietary system) can be mass produced and the 920 will work with future products. It also means that past wireless charging systems, like Palm's Touchstone charging dock also work with the Lumia 920 as demonstrated in the video above.