Sage have just released their MAS 500 roadmap which contains the next few years’ product direction as compiled in January 2010.
Included in the document are version release schedules through 2012 (expect one per year) as well as product update cycles (minor releases) which should occur 4 to 5 per cycle and include both program fixes and new enhancements. These updates are planned for release about every 3 to 4 months.
There’s also a version retirement schedule to provide updates on when versions 6.3 through 7.2 will be retired.