I expect:
- 30 fps lock
- Limited only to 720p and 1080p
- Exclusive fullscreen only
- No graphical options, just Default and Normal presets
- No FOV slider, set to 55 by default
- Motion blur, film grain, vignette and chromatic aberration always on
- Tons of mouse smoothing and acceleration
- Can't rebind controls
- Can't use mouse on menus
- No sound options
- Tiny subtitles
- Can't alt-tab
- No quit to desktop button
Being Microsoft of late they'll probably do no fullscreen option at all.