Originally Posted by lknracer

This is more a question of product lifecycle than need. Mugen does running part changes/updates along the way to extend their product lifecycle. Here are some approximate dates for their history of product lifecycle:

Mugen MBX-5 4/2004
Mugen MBX-5R 10/2006 (30 months after MBX-5)
Mugen MBX-6 9/2008 (24 months after MBX-5R)
Mugen MBX-6R 4/2012 (42 months after MBX-6)

Based on the history above, the soonest we'd probably see a MBX-7 would be 4/2014 (24 months after MBX-6R).

If you're looking for one or more models per year, I think we all know other brands that use that paradigm.