Always look at previous history, almost after every new 10.X release, the previous 10.X.X is the last one and there are no future updates.
Wow, I'd forgotten 10.4-6 required a year or more each for beta development. Bertrand Serlet wasn't playing around, he pushed OS X development to its edge and made certain GM releases were stable enough for release (there were a few misfires, however those releases had the most drastic system overhauls and features than most OS X releases).
Before 10.7, beta's were released weekly/bi-weekly and required burning the image and a clean install. This allowed for better debugging as it wasn't an "update" over previous beta's that may have third party app's and poorly executed updates which result in unrelated OS X debugging. The move to an iOS based developer structure with 10.7 seems to be negatively impacting current releases (I've never seen so many unresolved bug reports for fellow developers and AppleSeed invitees). Lowering developer memberships a few hundred dollars to $99 was great, but the subsequent push for yearly releases seems rushed and less than stellar.
Last edited: