Ratings board lists 22 potential Virtual Console games including Super Mario Bros. 3, Sonic 3, and many others. http://www.nintendoworldreport.com/newsArt.cfm?artid=14032 The following games have shown up on Australia's OFLC Classification database.
SUPER MARIO BROS. 3
SONIC THE HEDGEHOG 3
SHINOBI III: RETURN OF THE NINJA MASTER
LANDSTALKER: THE TREASURE OF KING NOLE
PROBOTECTOR II: RETURN OF THE EVIL FORCES [known as Super C in other regions]
SUPER TURRICAN
ESWAT: CITY UNDER SIEGE
WRECKING CREW
STRIDER
DEVIL'S CRUSH - NAXAT PINBALL
DROP OFF
SHOCKMAN
BATTLE LODE RUNNER
SILENT DEBUGGERS
BONK'S REVENGE
VOLLEY BALL
YOSHI'S COOKIE
GHOULS'N GHOSTS
NINJA SPIRIT
GALAGA '90
BLAZING LAZERS
AXELAY
CRACK DOWN
It should be noted that not all games that show up on the ratings site are confirmed to be released on Wii's Virtual Console, but if this is a sign of what may come, we may see the likes of Super Mario Bros. 3, Sonic 3, and many others soon.