Spot on. Consumer Macs are one thing, but for their high end product (is it still their flagship? Even still it's very high end) I doubt they'll want the product hampered by all the bugs and freezing issues and whatnot that may have been generated by Leopard. It'll give people a bad impression, and people will be saying "wow, even the Pro quality has gone downhill, that marks the end, it's all iPods from here on" blah blah. Giving people a bad impression of the Pro wouldn't be good.
Have patience.... don't know about you lot, but I tend to prefer things to be done *properly* rather than quickly. I've had 15 years' worth of shockingly bad rushed releases in the PC world, that's one reason why I moved to the Mac They should only release a new Pro when it's at the standard people expect from Apple.