I don't have any specific information but I wouldn't be surprised if Astro-Physics is in the process of redesigning the 900 with features similar to those found in other recent models. The Mach1, the 3600, and now the 1600 have all incorporated some similar elements such as repositioned motors, through-the-mount cabling, and the like (although the introduction of the Mach1 seems to have started the trend rather than being a redesign of a current production model).

If it's happening, it'll probably be another year before we seem them.

Best,
Danny