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And yes, MH3 was supposed to be on PS3 but they decided against it because of costs. The game still looks gorgeous and is one of the few games on Wii to showcase it's power. Hopefully, MH4 will be multiplat for WiiU and the other two next-gen consoles to take advantage of the large space on WiiU's discs for loads more content (Xbox360 unfortunately does not have high density discs) and knowing Capcom, they'll want to cram so much into the game.
However, there was a MH remake on the Wii in Japan, Monster Hunter G, so that makes 2 MH's on Wii.