I have written before on how better tools are needed on the AMD side to do gpgpu stuff, in some detail. I had particularly pointed out the need for their drivers to support 4 4870x2 cards in a PC as it makes for a nice 9.6T toaster.
This announcement certainly means that they are stepping up their efforts, though a true C compiler remains in the foggy future. Further, this thread says that they expect drivers to recognize them (the four cards that is) allright.
I saw a few people eager to make such a toaster. Well, with that announcement, good luck guys.
And this suggests that a C-to-IL compiler may not be so far into the future either. Well, good luck guys, give us a C compiler quickly.