I'm not sure if this is the right thread for gyms or not, but here's something I'd like to see:
1. Steel
2. Psychic
3. Water
4. Fire
5. Dark
6. Normal
7. Grass
8. Poison
As for the Elite Four:
-Electric
-Flying
-Rock
-Bug
Hum, I think that Steel as first Leader is just... Off. So Off. Sorry.
And, because I feel like it, I shall do the same on predictions.
Gyms
1. Normal (I don't know why, but... It seems fitting, to me)
2. Psychic (the floor changing in the trailer?)
3. Flying
4. Ground
5. Water
6. Ghost
7. Grass (the Vine Swinging in the Trailer?)
8. Bug (the Cobweb in the trailer?)
Elite 4
1. Fire (the fire place in trailer?)
2. Steel
3. Poison
4. Ice
So farfetch'd, but what I would want to see
I hope our haunted house dungeon is awesome this gen like the pokemon tower or old chateau. The bell tower in unova was okay but the Poemon Tower was awesome due to the myths around it as well as its own creepy atmosphere. The old chateau had its fair share of creepiness and it had actual ghosts! The bell tower in Unova as well as Mt.Pyre in Hoenn just didn't feel creepy enough and only Mt.Pyre held some sort of an interesting story, the bell tower just had the bell...
Pokémon Tower had nomyths, and the whole place was more soothing than creepy. The Memorial House was just... Nothing. Bell Tower had nothing special.
Mt. Pyre had a myth, and actually was involved with the Story, instead of just being there.
Old Chateau was nice though, for it's backstory and the sense it was the only one actually marginally ... "creepy-ish".