Alright. Let's talk stages. I'm sure it's already been covered elsewhere but I'll do a breakdown of what has been revealed.
There are currently 103 stages yet the picture of Stage Select shows that there is a possibility of another 6 that could still be added based on the black gap on the bottom row.
What are all the returning stages? Well, let's break it down.
Super Smash Bros 64 (7/9)
ReturningPeach's Castle
Kongo Jungle
Hyrule Castle
Yoshi's Island (now called Super Happy Tree)
Dream Land
Saffron City
Mushroom Kingdom
Did Not Make The CutPlanet Zebes
Sector Z
Super Smash Bros Melee (21/26)
ReturningBattlefield (Technically not the same stage but same layout. 1st time introduced.)
Final Destination (Technically not the same stage but same layout. 1st time introduced.)
Princess Peach's Castle
Rainbow Cruise
Kongo Jungle (now called Kongo Falls)
Jungle Japes
Great Bay
Temple
Brinstar
Yoshi's Island (Melee)
Yoshi's Story
Fountain of Dreams
Green Greens
Corneria
Venom
Pokémon Stadium
Onett
Mushroom Kingdom IIBrinstar DepthsBig Blue
Fourside
Did Not Make The CutMushroom Kingdom
Poké Floats
Mute City
Icicle Mountain
Flat Zone
Super Smash Bros. Brawl (26/29)
ReturningDelfino Plaza
Mushroomy Kingdom
Mario Circuit (now called Figure-8 Circuit)
WarioWare, Inc.
Bridge of Eldin
Norfair
Frigate Orpheon
Yoshi's Island
Halberd
Lylat Cruise
Pokémon Stadium 2
Port Town Aero Dive
Castle Siege
Distant Planet
Smashville
New Pork City
Summit
Skyworld
Shadow Moses Island
Luigi's MansionPirate Ship
Spear Pillar
75 m
Mario Bros.
Hanenbow
Green Hill Zone
Did Not Make The CutRumble Falls
Flat Zone 2
PictoChat
Super Smash Bros. 3DS Exclusive Stages (18/20)
Returning3D Land
Golden Plains
Paper Mario
Gerudo Valley
Spirit Train
Dream Land GB
Unova Pokémon League
Prism Tower
Mute City SNES
Magicant
Arena Ferox
Reset Bomb Forest
Tortimer Island
Balloon Fight
Living Room
Find Mii
Tomodachi Life
PictoChat 2
Did Not Make The CutRainbow Road
Pac-Maze
Super Smash Bros Wii U Exclusive Stages (19/24)
ReturningBig Battlefield
Mushroom Kingdom U
Mario Galaxy
Mario Circuit
Skyloft
The Great Cave Offensive
Kalos Pokémon League
Coliseum
Flat Zone X
Palutena's Temple
Gamer
Garden of Hope
Town and City
Wii Fit Studio
Wrecking Crew
Pilot Wings
Wuhu Island
Windy Hill Zone
Pac-LandDid Not Make The CutWoolly WorldJungle Hijinxs
Pyrosphere
Orbital Gate Assault
Miiverse
Super Smash Bros. 3DS/Wii U Shared Stages (8/8)
ReturningBoxing Ring
Gaur Plains
Duck Hunt
Wily Castle
Super Mario Maker
Suzaku Castle
Midgar
Umbra Clock Tower
Super Smash Bros Ultimate Stages (4 so far)
New Donk City Hall
Great Plateau Tower
Moray Towers
Dracula's Castle
So, I expect that there will be more new stages to fill in that bottom gap. Much like how Sakurai has warned not to expect too many new fighters, I believe that same warning will apply to stages. Ten new stages is low compared to past entries but it is one more than the original game had and with all the returning and updated stages there is still a lot to play on.
Adding up the numbers, there have been 116 unique stages created so far over the various Smash games with the 4 new entries in Ultimate bringing that total to 120 at the moment. Of the 116 past entries, 17 did not make the cut. 5 of those are from Melee so it looks like Ultimate won't be able to replace it after all.
In a lot of cases, the stages that didn't make the cut seem to have already had another stage similar to it appear in a later version that I guess is considered superior. The biggest surprise might be Flat Zone 2 from Brawl not making the cut since it returned in 3DS and is the only stage to return in another game that isn't appearing in Ultimate. Some of the stages are of the side-scrolling nature that a lot of people have often complained about. And in some cases, things have changed to make it hard to bring a stage back. MiiVerse is no more. Ridley is a fighter and different than his appearance as a stage hazard in Pyrosphere. I can't say I'm too heartbroken over most of the stages not returning but there's a couple I would have liked to have seen brought back. There's always a chance of DLC to complete things in the future, I suppose.
What are your thoughts on the stages that are in and out?