[Al Skierkiewicz]

Joe,
The new pump has similar specs to the old pump and it is considerably lighter. However, it does struggle a little near the cutoff pressure. Heat is a really big issue. A team in Chicago last year was diagnosing a leak and had the pump running continuous for about 20 minutes when the tubing near the pump had reached a sufficient temperature and failed. The noise was like a gunshot and scared everyone within about 15 feet.
The relief valve that you may remember no longer comes pre-set for 130 PSI. Depending on how it was assembled it may not operate at all. So be sure to calibrate it the first time you use it. For the old pump, the piston seals leak at about 150 PSI, I don't remember if the new pump can even get up that high.
The temptation for some teams is to use a secondary regulator set for something less that 60 PSI. Many valves have a minimum pressure spec and therefore do not seal at or below that pressure. Typically 20-25 PSI. If you chose this design, just be sure to meet the minimum specs.
The PVC tanks were in for the first time last year. They do need to be used with caution. OSHA issued a warning and recommendation about PVC used with pressure. If the vessel is struck while pressurized the failure produces significant splinters. Keep tanks away from the outside of the robot and away from moving robot structures. The pneumatic rules were relaxed last year, paving the way for any storage vessel including 80/20. I can't tell you what the 2012 rules will hold at this point.