I hope they have a few good mid-sized levels this time. Smash 64 had Great Fox, Hyrule, and Saffron City which were my 3 favorites. Then Melee had a bunch of tiny things and one HUUUGE Zelda level, plus a bunch of crazy gimmicky stages. I liked some of the stuff they experimented with in Melee, but without a couple good mid sized stages I never felt the selection was better than SSB
I also hate stages with no pits, where you have to knock people off the sides. Kills the fun of spiking and recovering from beneath the platform.
So far all of the stages they've shown look to follow Melee's lead... but I guess with 40 stages or so there must be a handful I'll want to play