We all know they're gonna do it. There's too much money in it for them not to. They've done the same thing with yellow, crystal, emerald, and platinum, and I'm sure this won't be any different. They just say they aren't working on it as a ploy to keep money. The rumors end up serving as advertisements, then they have people practically begging for the game. I'm sure there's one coming out though.
UPDATE: see this question for details