So from my original list of what I've wanted for the last few years:
-creating a world map
-correct mario world checkpoint
-Slopes ✅
-Missing SMB3 powerups
-Use one games powerups in another game (ie yoshi/cape in SMB, raccoon/hammer suit in SMW etc)
-wings being usable on yoshi
-poisoned mushroom
-p wing
-on/off switch ✅
-Tweester ⚠ (they kind of have an enemy like this, but not quite the same)
-water on land ✅ (to some extent at least)
-One way pipe
-Pipe that lets you out in the same area (as seen in the smb3 wraparound pipeworld level in ludvig von koopa's world 7) ⚠ Maybe the clear pipes will do this?
-multi coloured yoshi/koopas /w ability changes for ingested koopas ⚠ (we saw red so I assume the others are there)
-Magic ball, so you can finish levels when YOU want them to be finished ⚠ No magic ball so far, but there does seem to be changeable goals
-bosses (big boo, reznor, boom boom, kooplings) ⚠ boom boom is in
-Vertical stages /w optional wrap-around ⚠ Verticality is better then SMM1 at least
-Desert Theme ✅
-Sky Theme
-Snow Theme ✅
-Night Theme ⚠ (there was something like this there, so it may be in - or it may be that there are backgrounds are separate from themes now, and that each theme has multiple backgrounds)
-Tank Theme
-Battleship theme
-grab block
-3up
-dragon/star coin
-key/lock
-power balloon
-water levels that go up and down ✅
-crushing columns
-controllable coin line block
-wind
-triangle block
-CHARGIN CHUCK
-angry sun ✅
-all hammer bros (amazin/fire/boomerang/sumo etc) ⚠ (Fire Bros at least are in now)
-blargg
-thwimp
-eerie
-ninji
-boo block
-"floating" Boo Buddys (where they are not scared of you, but also move randomly, seen in SMW ghost houses)
-pokey
-nipper/fire nipper
-block goomba
-mechakoopa
-fishin lakitu/boo
-red pirahna plants that ignore whether you are near a pipe (SMB2/LL)
-jumping pirahana plants (though I guess wings kind of emulate this)
-ptooie
-rotating cannon
-fire snake
-flame chomp
-rotodisc
Happy to see some of the most important things (slopes, verticallity, water, on/off) are already in, which is good.