The film grain is really really subtle. It's barely noticeable during gameplay, because it changes every frame. It's more visible in static images for that reason. It also has a purpose. DXT compression and color correction causes slight 'banding', especially in clear skies. The grain hides this. It's also much less than in most games (L4D for example).
The grain also hides the nature of the temporal dithering on the blur.
Also, in the first image (the one with the C47s, is actually an old screenshot with twice the grain amount. I kept it in the update because it was difficult to reproduce in-game. It was just a random image taken at the right moment, I felt it was more honest than posing it.
Either way, our beta testers were really on top of things to ensure it won't negatively affect gameplay, so don't worry about it. Once you get used to it, you don't want to go back. It really adds much to the immersion.
There's also no noticeable performance impact. In fact, I optimized the shaders so there might even be an improvement. Due to BF2 engine limitations, the shaders also had to conform to Shader Model 2.0, which it still does. I've also added simpler shaders for medium and low quality.
@jan_kurator: it has always looked like that, but yeah, I need to spank a mapper for that.