I finally played the demo and it was awesome.
At first, one of my friends kept complaining how "they changed Marth" and "there's too few characters", both of which struck me as weird since he's a Mario main and barely even touches other characters.
A couple of hours later he wouldn't shut up about how much Mario *****.
G&W+l-cancel is just great and uair is too good, his dthrow is also really fun to use.
Zelda's really good too, she still suffers from her incredibly slow grab, but has so much good stuff it didn't matter.
I love the new dair on grounded opponents.