Drupal 5.0 Released
Whats new in Drupal 5.0 videocast
Looks great and this is a final release [not beta or rc] but with all things application related, it will be awhile before true stability and production-readiness is achieved. Not to mention all the modules and themes that might need to be ported.
I’m not quite sure if I will update from 4.7 to 5.0 in the next Suite release. Its 50/50 as of right now.