I really don't understand the Xeon product line, so...are the Mac Pros using outdated Xeons? Are there newer, faster CPUs than what Apple is offering? Can you go to Dell and buy a faster workstation?
http://arstechnica.com/apple/2012/07/signs-point-to-july-25-mountain-lion-launch-date/As we wrote last week when OS X Mountain Lion entered golden master status, Apple has a tendency to make announcements immediately following its earnings calls. Apple released OS X Lion last year the day after its third-quarter earnings call—also in July—alongside new MacBook Airs, Mac minis, and Cinema Displays. According to 9to5Mac's sources, however, this year's Mountain Lion launch isn't expected to coincide with new hardware.