Nope. The price drop was to justify the price drop for the 2006 8800 GT.
You're stuck with these three for the run of this model.
I just dont understand though why apple would drop the price for the 06' mac pro's version of the 8800gt gpu when its the exact same as the 08 model?? They could have easily charged the same price it was going for on the 08 version.
This is why it leads me to believe there will be more gpu updates (not right away of course) but maybe end of this year with new ati cards. I think that they dropped the price on the 8800gt cards so that apple can get rid of the current 8800gt cards in stock sooner getting ready to release a new card.
I think that apple is much different than what it was 3-4 years ago when it was tied down to PPC. And now with intel and it even surprised me with the 8800gt cards available on the 06 model mac pros that I wont be surprised if newer cards are available for the mac pros. Also dont forget that apple uses the same intel now which is alot easier to implement the same gpus and support for it as well.
Either way I'd probably stick with the 8800gt for another year as its more than enough for me since the only game I play on the windows side is COD4.