For them to have an essentially unchanged line of full size cats since 2012 (Barring the wet clutch to dry clutch improvement, the X and X limited) I would be hard pressed to think something new won't come out sooner than later. Polaris and Can Am, in the same time frame, have released drastically different and improved models (XP900 to XP1000 and Maverick to Maverick XDS Turbo) and now again AC is falling far behind.
Here's to hoping they introduce something new and exciting really soon. Can't wait to own a used one in 3 years. lol