The Wreck it Ralph line is questionable; I thought I once read somewhere that Nintendo actually offered Mario to be used, but the creators of the movie couldn't really find a way to include him in the movie while doing justice to Mario's legacy, so they put him on aside for a sequel. So that's pretty much the opposite of what's said here.
I've always thought Disney and Nintendo would go well together, I'd like to see some of this rumour happen. The Mario x Mickey game needs to happen. Throw Darth Vader in there and you'd have the three most recognizable pop-culture figures ever in the same game!