Well, I doubt even the next generation of video cards will be able to do much better at 1200x1024 res with 16x AF on such a robust graphics engine.I know things have changed since the 9700 cores, but 16xAF for 1200x1024 is a little redundant anyway. At that high of resolution, I would think you would only need 2xAF with 4xAA.
What I'm hoping for the next generation of video cards, like the RV420 and the NV40, will host a less performance hitting trueform ability. Also, the newer games such as half life 2, will be more dependent on precision floating points and shaders which are more GPU intensive than bandwidth intensive. So hopefully even the 9600 can push decent framerates in HL2. Don't forget, not only is the hardware advancing, but the also the backend. The software, the compilers, the assemblers, the code, the games graphic engines themselves are advancing with the hardware. There is more than one side to look out now.
None the less, you shouldn't concern yourself too much about a game that was "suppose" to have come out during the holiday season. The game , and games like it, aren't coming out for at least another 3-6 months (Splinter cell 2, D3, Quake 4, etc..). The important thing as of right now is that you don't have a dead end system in which you cannot upgrade.