Generally they are released for the anniversary, that won't happen this year as if its announced now, they won't be released until 2013 which breaks the Anniversary thing.
Also this has happened before. Junichi Masuda to make an "Important Announcement" on Smash. Ended up being the Mewtwo Download event. To my knowledge they don't have a current event running at the moment and the games are still brand new so I doubt we'll get remake info. Could happen yes, but least likely scenario since they are going to want to milk B2W2 as long as possible.