darkSpyro

All Swappables as of 8/5/13

Fire:
-Fire Kraken
-Blast Zone

Water:
-Wash Buckler
-Freeze Blade

Life:
-Grilla Drilla
-Stink Bomb

Tech:
-Magna Charge
-Spy Rise

Air:
-Free Ranger
-Boom Jet

Undead:
-Night Shift
-Rattle Shake

Magic:
-Hoot Loop
-Trap Shadow

Earth:
-Doom Stone
-Rubble Rouser

Non-Swaps
Fire:
-Fryno
-Smolderdash/Lightcore Smolderdash

Water:
-Riptide
-???

Air:
-Pop Thorn
-???

Undead:
-Roller Brawl
-Grim Creeper/Lightcore Grim Creeper

Earth:
-Scorp
-Slobbertooth

Magic:
-Star Strike/Lightcore Star Strike

Life:
-Zoo Lou
-Bumble Blast

Tech:
-Countdown
-???

Reposes:

Earth:
-Knockout Terrafin
-Lightcore Flashwing

Air:
-Lightcore Warnado

Water:
-S3 Gill Grunt
-Blizzard Chill

Life:
-Ninja Stealth Elf

Tech:
-S3 Trigger Happy
-S2 Sprocket

Magic:
-S2 Pop Fizz
-Mega Ram Spyro
-Possibly S2 Ninjini

Fire:
-S2 Hot Dog
-Lava Barf Eruptor

Undead:
-S3 Chop Chop


And that's it!

Ninjini WON'T get an S2. It's been said Giants are NOT getting reposed.

Hopefully the new landers will be as I think would come:

Magic - Cute magical female white rabbit wearing a magician's outfit and top hat
Tech - Robotic dragon (not Drobot)
Air - Another Sky baron based on Jet-Vac
Water - Female ice dragon

As for the returning Skylanders, I think the ones would come back:
Air - Sonic Boom
Life - Camo
Undead - Fright Rider

We already have like 7 topics for all of the characters that have been revealed... -__-

You forgot Nitro Magna Charge.