Yep I've got both of those on order for myself. I habe heard that the GNex will charge "from AC" usong that HTC car adapter. I expect it will do the same from the palm wall adapter as long as it provides enough current.
I'm been using the Palm chargers (wall and car) with no issues since I got the GNex last month. They put out 1A and the cables have a silver dot that makes it easy to tell which way is up.