You mean the lack of (dynamic) clouds, or do you really mean the actual color blue? In all the FH2 footage I have not seen a single blue sky.
FH2 does not feature the color blue, as there is a very large amount of yellow post-processing slapped over it.
That's completely false. Open the B-video. Opening clip - realistic blue sky. Next scene at 32 seconds, blue sky. Next scene at 43 seconds, blue sky. Next scene at 50 seconds, blue sky. Next scene at 59 seconds, night time, convincing blue-grey sky. Next-scene at 1:09, blue sky. Next scene, 1:17, green sky. No, hang on, it's blue. Next scene, 1:31, can you guess the colour of the sky? It's a tricky one, pretty unusual for this game. Yep, it's blue. Go figure! At 1:42, Playground Games have decided to mix it up a bit, and put some blue up there.
So in the video provided in this thread, there isn't any scene that hasn't go a blue sky, which suggests you're not seeing any blue skies necessitated you watching all media with your eyes closed...
As for the 'yellow filter' on every shot, clearly the white balance tends to favour 'warm', especially with brightly lit scenes (eg. 1:09 in Australia), and there's also a slightly yellow tint to the lens flare, but it's far from a yellow filter. Certainly blue is not turned green or grey thanks to a yellow filter.
Ultimately that post just makes you look kinda foolish as your claims are so easily and categorical disproved with the most readily available media.