If I understand the G10 housing options correctly, there is no housing that allows both WA and macro to be used on the same dive. (By WA, I mean, wider than what the camera can do unassisted.)
The DX-2G on the other hand, has a wet WA lens (16mm equivalent) that you can pop off and stow to shoot macro.
It seems like a good alternative to the G10 in a Fisheye or Ike housing. Since you can use its internal flash, you don't have to start with a strobe, which lowers entry cost, too. Of course when you do go with a strobe, you can't get fancy Ike-style electrical TTL, you have to do optical.
Any thoughts on this camera? It's so new there aren't any reviews yet, though it's easy to find info on the Ricoh it's based on.