According to Appleinsider, pre-production PowerPC G5 based Xserves have successfully undergone quality assurance testing earlier this week. Appleinsider had previously reported Xserve G5s as imminent in October, but according to today's report, Apple had run against some unsatisfactory QA results on a batch of G5 Xserves in late November. Expectations again place the Xserve G5 release as "imminent" at or soon after MacWorld Expo with delivery not until February. Appleinsider offers no new details on specs or form factor for the revised Xserve. Very few reliable details on the upcoming Xserves have emerged. ThinkSecret had hinted at a 3U enclosure was being considered, while Appleinsider posted unconfirmed hints of a revised 1U case. The Xserve was last updated in February of 2003 to Dual 1.33GHz G4s.