This driver is mainly for Kepler regarding GW2. It will boost certain Fermi based card performance (read: GTX 560 Ti and 570 the most of the bunch)
The GTX 670 and 680 will run properly and boost properly using the new driver, and their performance will be more in equilibrium.
Basically, you Fermi users are looking at a healthy 5-45% performance boost, but not necessarily on minimum fps only (so the overall impact might not be quite as significant as perhaps you're hoping). You Kepler users are looking at a more sizable 20-70% performance boost, but that boost will generally be in the area of minimum fps, not maximum, so your averages should improve well.
As for 8000/9000 and GT200 series owners? You're looking at a very minor bump, approx 3-10% in most situations. Unfortunately, the unified driver tweaks don't carry as well to the much older architectures.
However, it might be time to lay down a few bucks for a new GTX 650 or GTX 660 (Ti or otherwise). That would probably be a dramatic upgrade if you're still rocking a GTX 285 or below.
As for specific fixes...
All I can say is, most of those are focused on optimizing and tweaking internal features to match up with GW2's engine features, which will smooth out performance even more, especially with more options enabled (super-sampling, FXAA, shadow settings, etc)
One specific fix that I can mention is nVidia implementing an override to use their own FXAA3 technology instead of the built in engine's, which is superior not just in image quality, but in performance and is better optimized for nVidia's architecture.
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