AMD Catalyst 12.8 WHQL deeps a bit lower in Crysis 2 than 8.97 18 April but looks much better than 12.6 WHQL. Further more, latest WHQL driver is on par with 8.97 18 April in Metro 2033 and DiRT 3.
When it comes to Battlefield 3, performance is relative but the results are more than reliable, all three runs showed a margin of error of +/- 0.2 FPS. Having that in mind, 12.8 WHQL will deep lower than 8.97 18 April and even 12.6 WHQL.
I’m pleased to say that 12.8 WHQL fixes Skyrim’s HUD / UI issue present in the last couple of Catalyst drivers. But 12.7 Beta is still 4+ FPS faster; if you can live with the graphical glitch than you might want to consider still using 12.7 Beta when playing Skyrim.