Just watched the live NTSB press conference.
Notable points were that the stick shake and push systems were active just prior to the crash, de-icing systems appear to have been working fine on preliminary examinations, and the engines look to have been working as normal. The state of the wreckage strongly indicates that the plane crashed in the level flight position, and not a nose-dive as had been reported, and most notably was that the plane is facing north east, but was landing on a south west facing runway (23).
That's just a summary. Watch Sky News for the full press conference.
I'm just the messenger relaying exactly what he just said here - no opinion added from me.