I Still think the presence of the gear separated from the airplane means it was down at the time, 2 miles from the end of the runway you'd expect it to be up unless they where going for a forced landing.
Also the prop you can see in the video detached from the engine segment looks very much like it feathered at the time, but that really is making an assumption from a poor video..
Glide speed on a kingair must be around 130knts? is that classed high speed