Ghostcrawler has been mentioning they are trying to differentiate the three styles of rogue and hunter, even to the point where the hunter might be slated for a major revamp. Yet having played all classes, it really feels as if one spec or another is forced. Like they are trying to hard to add variety and end up just muddling it all. I would even go as far as saying the same about priest and warrior, two specs is more than fine for the most parts.
I would not be at all upset to have only two choices for my rogues or hunters, its iffy on my warrior but honestly the two dps specs aren't that far apart other than mostly visuals in the end. Rogue, I am so single spec there its not even funny.