I'm a little disappointed, but not at all surprised.
My gut reaction that a Mac Pro update, however much we want one, is not all that high a priority for Apple. And as already been pointed out, the next-gen workstation/server CPUs don't seem to be available yet, unless Apple is getting happy-happy from Intel WAY ahead and under the radar. If Apple drops new Mac Pros with Lion, I WILL be surprised. But they're almost certainly going get teh shiny on the consumer pitched MacBooks, Airs, and Minis first.
But the last Mac Pro update was a year and a half waiting, and pretty "meh" by most opinions. I don't think that Apple is really all that interested in the professional user market. When the new Mac Pros drop, whether it's later this summer, fall... or next year, I don't expect much more than thunderbolt, and a CPU and Graphics Card bump... and glossy display - no change there. Based on all indications and Apple's past behavior and apparent disinterest, I'm not holding my breath for eSATA, USB 3, Cutting edge Graphics Cards or other desired high-end tech. Blu-ray? Oh, DO dream on.
Your mileage may vary.