At this point, I imagine that the Quadro FX 5800 will be announced at WWDC when they show off Snow Leopard.
"And what better way to take advantage of Grand Central... than with nVidia's Quadro line?
Starting today, the Quadro FX 5800 will be available as a BTO option on the Mac Pro... *more fluff about the 5800*...
Oh, and...
The Tesla 1060. You can buy the Tesla 1060 as a standalone GPU or with a Mac Pro when you buy one... but, as you can see, you MUST have another graphics card with it because there are no video out ports...
Not a problem with Snow Leopard and Grand Central!"
*light laughter from the audience*