im a HUGE fan of supersmash brothers (only reason i bougth the wii) is there gonna be a fourth one?

Google and basic skill in researching should provide more info than we can.

Edit: Using said resources, I found this for you. http://en.wikipedia.org/wiki/Super_Smash_Bros._4

Yes, it will be on the Wii U. But besides that, we don't know a single thing about it.