IGN reports that the 3DS-Shop and its Virtual console will be available on launch via a software upgrade, which contradicts what we’ve been told today. They also state that Pokémon Black & White will be 3DS-enhanced, making use of some new features:
CAN I PLAY MY OLD GAMES?
A. The 3DS will be backwards compatible with all DS and DSi games. Those games will not be able to display imagery in 3D despite being used on the 3DS.
However, some games, most notably Pokémon Black & White, will gain some enhanced functionality when played on the new system. These cases should be considered extremely rare, however.