-Wii U to Switch world transfers is something they are working on but not at launch (cool)
-Switch has been very easy to work with
-60fps
-When it releases it will be on par on the January update and will be quickly caught up to the other versions after release.
-Switch (medium on PS4) is about 3072 x 3072.
-Vita / Xbox 360 / PS3 / Wii U are 864 x 864.
-PS4 / Xbox One are 5120 x 5120 (large).
So world sizes are roughly 13x as big as WiiU but not quite as big as PS4.
http://www.neogaf.com/forum/showthread.php?t=1361587