I have heard about it is it true?
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TY Wikipedia.An exclusive first look for what appeared to be a spin-off in the Kingdom Hearts series, that was to be released in 2008. It was an exclusive Wii game named "Mushroom Kingdom Hearts", featuring over 41 ( 4 as in April, 1 as in 1st) Nintendo characters and characters from the first two games in the series. The article was complete with artwork of a re-designed Mario holding a golden keyblade. Sora and King Mickey are pictured with him. Accompanying this picture was an image of a Mushroom with the Kingdom Hearts crown symbol on its head. EGM has confirmed in their March 26, 2007 podcast that the article was in fact the year's April Fool's joke, commenting on how the Mario design was a photoshopped image of the Super Mario Sunshine artwork.
Retrieved from "http://en.wikipedia.org/wiki/EGM_April_Fools%27_jokes#2007"
oh, for a second i thought they were going to make a game with mario & KH. =[.Electronic Gaming Monthly made Mushroom Kingdom Hearts as there April Fool's joke. It was a mix between Mario and Kingdom Hearts