Virtual Console will feature classic titles from past Nintendo consoles (going as far back as the NES) as well as from formerly competing systems, such as the Sega Mega Drive/Genesis and PC Engine/TurboGrafx 16. While the entire catalogue of games for these machines will not be offered, the "best of them" will be available. This gives the companies a pool of over 1000 Sega games to choose from. More notably, some games may offer free retro downloads as a bonus for the purchase.
While the gameplay will be the same for all of the retro titles offered via the Virtual Console, Nintendo has stated that some of the games may be improved with sharper graphics or better framerates. In addition, gamers may be able to download games that were not originally released in their region, and some multiplayer games may be playable online, if it is technically possible. The Virtual Console service will not be used exclusively for retro games, however. The service will also offer new and original content from independent developers.
Taken straight from the Wiki article. I'm just as excited to play old games as I am to play some Indie games.