ONM Answers a bunch of NSMBWii questions (Slight Spoilers)

[puffy]

Mr Khan said:

Happy:
Star Coins are useful for something awesome (though we don't know what)
None of that "mini-mushroom to access this whole damn world" crap
Sad:
No single-playable Luigi (ever? Even after beating the game?)

I'm pretty sure it's just to unlock trick videos and other videos similar