Consider my mind blown if they actually released Dream Land and Dream Land 2, since they're Gameboy games.
My exact thought. They can't include them, unless they emulate them through Super Gameboy.
Anyway, I guess that the disc will have only the SNES spin off games. Unfortunately, a cheap anniversary celebration like Mario's 25th All-star disc.
Can't say that will be for sure. Mario had the previous All-star disc for the SNES, and they made a wii port for it.
What collection disc does Kirby have?
They can also add stuff that isn't from the games, you know; like a compilation OST, collectibles, and such. And if Sonic Team did put Gamegear games in their Sonic Gems Collection, why can't HAL do that?
Carbondog, Dreamland 2 is for the 3DS VC in Japan already, so we can wait for it to be released here.
But let's say you're right, so what will they do?
For instance, since Nintendo is so cheap with their anniversary collections, they will just develop them for only the wiimote. If you make that rule, then you won't be able to play SNES games and further generations because of the lack of controls.