Here let me add confusion to the mix, I went ahead last Wednesday (10am PDT) and placed an order for 2 2009 Mac Pro's to upgrade my kid's 24" aluminum iMac's. I ordered them both as follows
Two 2.26GHz Quad-Core Intel Xe
6GB (6X1GB)
ATI Radeon HD 4870 512MB
640GB 7200-rpm Serial ATA 3Gb/
One 18x SuperDrive
AirPort Extreme Wi-Fi Card
So basically added the 4870 video card and the Wi-Fi card to both. Now here's the weird part, they we're both listed as shipping in 3-5 business days, but Friday morning one of the two computers shipped, while the other hasn't shipped at all yet (it hasn't even gone to prepared for shipment). That seems odd, as I would have expected both to come out at roughly the same time. So does this indicate some kind of supply shortage at the actual factory as well (also indicating a possible refresh coming soon), or is it purely coincidence (I've never ordered two at a time before, the other 2 I already have we're ordered separately).
*shrugs*, who knows is probably the best answer, but either way, I wasn't going to play the waiting game, and the 2009's will do plenty fine for my kids (I'm still on a 2008 Mac Pro here, would like a better video card than the 4870 but that's about the only thing I would like to upgrade on my system, as I'm already running on a pair of SSD's)