I didn't get the charging plate in the store... it totally phased me to even ask. I'll let the dust settle a little more on this since I bought it off contract and I'm seeing all kind of stuff conflicting with that.
Well... my last phone was an HP Pre 3 (and I had each Pre iteration before that) that uses their wireless touchstone chargers. Same idea, wireless inductive charging. I tried it on my new 920.
It worked!!! It may not be as efficient (can't tell until I tested both) but it does charge the phone. It is by no means secure since the palm phones used magnets to hold them, but I'm thinking I'll hack together my own charging plates. Palm touchstones are dirt cheap and I already have three of them.