Just because this thread is a bit off topic at the moment anyway, I will say my two cents.
I would like to have Ganon featured in a game set post
tWW, where he has a constant throbbing headache, and a kick-ass scar on his forehead, a constant reminder of how he keeps screwing upo world domination, and reminds him of his deafeat, making him more enraged and frustrated.
Secondly, I think as far as new enemies go, there is a lot of potential in Majora's Mask as a recurrring villain. The three day thing has been done, but i think having him back again could work. If Vaati can have multiple games, so can Majora. The mask could come back, looking in very bad condition after being defeated by link, and drifting over the ocean for 500+ years. The mask could now posess the body of a little boy, or a goron, or an adult, like the mayor of a village, or even the girl in link's adventure, adding that personal touch (malon, sario, marin).
As far as the master sword in the game goes, It may appear, it may not, I'm not fussed, although I am leanign towards the fact that it will, as Ganon is most likely in it, and I have a feeling Nintendo will use it anyway.