I really dig the carefree theme of the game, at least in the initial phase, it gets more serious later
However, for future expansions, I believe Larian can go more mature and epic, in terms of both story and gameplay.
Provide better benefits for being more specialized, for example
Mages should learn spells of epic proportions and scope, calling meteors from the sky, stopping time and calling demons. Warrior should be able to carve the most powerful enemies in two, while thieves should be able to finish battle before even begins.
Unconventional characters: flying dragons that join the party, powerful undead (vampires, mages), demons or scoundrels. I am pretty sure you know how to deal with unconventional characters.
more exotic locations: dark and foreboding, underground lost ruins with little air and light...
anyway, my 2 cents. I know the game has been released yesterday (in a methaporical way) and it's way too soon to even think about it, but just tossing ideas around :P
