A 3D version of Kirby's Adventure is now available on the 3DS e shop if you're interested. I have it on the Wii's virtual console and I can say that it stands the test of time better than most NES games. Really delightful.
Nintendo released Super Mario Land and Super Mario Land 2 in the Virtual Console right before the release of Super Mario 3D Land. With 3D Classics: Kirby's Adventure and Kirby's Dreamland in the Virtual Console, it won't be hard to suspect an original Kirby game coming soon, probably in 2012.