No hydraulic fluid, deice/anti-ice fluid on the sighting window. Nothing like trying to make a contact with a A-10 or B-1 at night and not being able to see out of the window due to it being covered in hydro fluid, hoping you don't hit the canopy/window. According to the test guys in Seattle night AR will be IR. The ability to see completely behind the tanker with the multiple camera angles and views.
The biggest change for -135 Booms is sitting up, not having to fly the boom around while in contact. A majority of -135 Booms have neck, shoulder, or lower back problems due to the 1950's era ergonomics.