Hey guys,
could someone tell me what differences there will be between both version? I know about graphics of course and different stages, but I'm asking about gameplay. Can we say both game will be identical gameplay-wise?
They should be. Stages, in theory, though, can affect gameplay. But they should both be 60fps (if 3ds is 60, wii u better be). All characters and moves should be the same, unless some balancing happens between 3ds release and wii U release (which is entirely possibly, given that they'll know which characters are doing the best/worst in for glory). I'd hope they'd patch the 3DS version, too.
Features will likely be different, due to hardware limitations. For example, maybe the Wii U one will let you save replays and upload to youtube, but the 3DS lets you upload screenshots to tumblr (both conjectures based on precedence with mario kart 8 and animal crossing new leaf).