ONM RUMOR IS NOT AN APRIL FOOLS!
OMN related to the ganondorf rumor in soul calibur 2 and they stated in an email to gonintendo that people got upset with them when they announced that it was april fools joke after.
“The game may end up being announced online before we hit the shelves. Ocassionally these things happen and it’s completely out of our control. However, the point is that we are not misleading you — there is a new game due to be announced.”
And last but not least remember anything can fit into that constellation!
Check the link for the full information/email.