I'm likely one of the few people left in the world who has yet to play Cave Story, so I'm looking forward NIS America's November release of Cave Story 3D on the 3DS. While I'm not a fan of 3D, as I feel it's often a gimmick, there are a couple 3DS games, such as Dead or Alive Dimensions and Ocarina of Time, where it's really worked well. Cave Story's environments appear to lend themselves to an interesting use of the technology at least.
That said, I'm more interested in the game for its Metroid-style gameplay and exploration than its use of 3D. All reports of those who have play this in any of its prior forms has had nothing but praise for it, so I'm in full support of this retail release.
Update (09/09/2011): Originally, NISA released screens that were supposed to highlight the 3D environments, but those screens did not work very well when transferred to the 3DS for viewing, so here are some general screens from the game.