FH3 will not satisfy those looking for "Sim Racer" features. As for wheel support, they have said they are working on it - today the support is more for standard wheel/pedal combos like my Thrustmaster TX w/T3PA pedals. The FFB is NOT on the level of the PC sims but I still would rather use my wheel as I'm terrible with a gamepad.
Window or full screen with custom resolutions - yes. My monitor supports 3440x1440 but it takes more than my PC can handle at Ultra settings, I'm hoping they will optimize but still looks great. As for mouse look and TrackIR, no. We have to remember, this is the first go at a PC version of a AAA big budget car game - they may or may not develop more features for the PC version. There's no comparison on what has gone into this game compared to AC, R3E, rF2, pCARS, etc. - it is a feature rich and polished "game". It won't be for everyone, especially if sim features are a requirement. I'm not saying I'm a "hard core" racing sim guy but I've had most every sim game since ever (old as dirt) - car games is all I play (Dirt Rally, pCARS, AC, R3E, AMS, fFactor 2, F1 2016 soon, ...) with a preference to "sim" types but I do enjoy most any car game as I'm car enthusiast. I love cars (BMW twin-turbo IRL now) and have had many performance cars over the years, many I've tweaked/built engines/suspensions. This all means nothing as we are all different but only added for why I would purchase an arcade car game. It's got cars, they look and sound fantastic, it's open world exploring, and technology (accomplishments) interests me. My $.04
EDIT: I'm getting noticeable steering lag on the PC, will have to try on my XOne as I don't remember this with the demo.