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"I almost regret informing you of the mysterious lack of Mac Pro updates, while the rest of the line has received a strong series of updates."

New Mac Pros will be out early next year. I think Intel is having trouble getting enough volume on the next-gen Xeons. Apple grew concerned about grumblings from pros who really want new machines, and actually unveiled a future plan:

Franz,
Thanks for your email. Our Pro customers like you are really important to us. Although we didn’t have a chance to talk about a new Mac Pro at today’s event, don’t worry as we’re working on something really great for later next year. We also updated the current model today.
We’ve been continuing to update Final Cut Pro X with revolutionary pro features like industry leading multi-cam support and we just updated Aperture with incredible new image adjustment features.
We also announced a MacBook Pro with a Retina Display that is a great solution for many pros.
Tim (Cook)

From:

http://www.forbes.com/sites/connieguglielmo/2012/06/12/apple-says-new-models-designs-for-imac-mac-pro-in-works-due-in-2013/

I'm looking forward to seeing the new Pros. :-)

New Mac Pros will be out early next year. I think Intel is having trouble getting enough volume on the next-gen Xeons.

The volume is there. Mac Pros are still using 6-core Westmere Xeons from 2010, while the competition such as Dell has moved to the latest 8-core Sandy Bridge-EP. There's just no comparing the CPU power, bus bandwidth and memory bandwidth of the two. The Mac is even using an older Intel chipset.

For $5,600 Dell will give you a dual 2.4-3.1 GHz 8-core Xeon with 16 GB 1600 MHz DDR3 ECC RAM and a 2.5 GB professional video card. Apple will give you a dual 2.9-3.3 GHz 6-core Xeon, 12 GB 1333 MHz DDR3 ECC RAM and a 1 GB Radeon gaming card for $6,200. Professional workstations are about the horsepower and ISV certification, and Apple is sucking on both counts. And Apple can no longer even play in the league of the serious professional, offering only a mid-range gaming card and 7200 RPM SATA disk and SSD storage, while the Dell offers a 6 GB $3,000 pro card, and adds the option of 10K SAS drives, with a hardware RAID controller sporting its own dual-core PowerPC CPU and 1 GB of non-volatile cache. If you want fast storage on the Mac, you have to buy the fibre channel card and hook it up to a SAN. The Dell even has 3-year support and a Blu-ray burner included.

It's sad. A few years ago, the Mac Pro was the best workstation value on the market.