Because the rumors are more about what they aren't doing. Of what they are, it's all Avatar, star wars, eventually, maybe frozen overlays, soaring updates, imagination redo. Other things were rumored then either canned or proven false.
Main reason for it is Universal has the momentum, Uni Parks & Resorts president Tom Williams quote "We've already got the next five years planned out. We already know what we're going to do after Diagon Alley. Plus 2015 will be the 25th anniversary of the opening of Universal Orlando. So we've got something special in the works for that as well,"
Nothing other than Avatar on the Disney side like that, for better or worse.