Does this mean the further FW updates/improvements are coming to a close for the 450/450i/450m/450b line to make more time for the 450v product family?
No… there are some very important updates coming in the next release, R24.2, that will be highly beneficial to ALL 450b/i/m/v radios… namely the deep VC queue optimizations. Also still coming is uplink interference mitigation on the 450m 3GHz radios, although I’m not sure what R24 release this will be available in.