SEGA finally made Sonic the Hedgehog 4: Episode II official with a teaser trailer, but the first video makes no mention of any Nintendo formats.
The teaser's closing screen mentions the following formats:
PS3 (i.e. PlayStation Network
Xbox 360 (i.e. Xbox Live)
Of course that doesn't mean we definitely won't see the game on WiiWare or the 3DS eShop — or hey, even on Wii U's digital storefront — but not seeing Nintendo formats confirmed right off the bat has us a little edgy.