Also I doubt its I/O bound because there is still lots of scanning to do (but I am not 100% sure). Also with fast hard drives (or SSDs) it might be CPU bound.
Also, when running applications currently the CPU must load the app, scan it, then run it, while the GPU can probably do it faster thus making the system overall more responsive.
Wait... Also, the real-time scanner is limited. It does not do a full check on every file because that is too expensive (though it might be damn close), with the GPU they might have the power to make scanning through your whole computer 99% moot since every time any program executes the virus scanner gives it a 100% scan, fast, without the user even noticing that it happened.
I can see lots of benefits of this. Go nvidia.
I am hoping nvidia kicks intel to the stone age with a new processor and such. Or at least comes up with some REAL competition, something that AMD started but could not maintain momentum. This is probably step 1. :)