Wario the Master of Disguise
The known possible sequel to the excellent Wario Land series, this game seems to meet all expectations (after seeing the very limited media available so far). There are many new power ups which seem to be in the form of costumes, all new worlds and areas and more of the same wacky exploration.
Power up wise, there seem to be more than expected, and they look awesome. Spaceman Wario has a laser which can be used to attack, Thief Wario is agile and uses physical attacks, Dragon Wario breathes fire to attack enemies and Dr Wario can activate machinery in various levels, such as a few robotic gadgets seen in some of the screenshots.
Now, the areas seem to be pretty diverse, and based around locations seen on TV. There is definetly a Cruise Ship based level, a first in the Wario series as far as I know (a non pirate themed boat level!) and many others. However, although I don't know the other levels, a good guess is that they are based around pretty strange themes, like in the other Wario games like Wario Land and Wario Land 4.
There also seem to be treasure chests which must be unlocked by solving a simple touch screen puzzle/mini game. Not much is known about the role of treasure in this game though, although a good bet is that various things can either be unlocked or affected by the amount of money collected as with previous games.