Too early to know what happened in this crash and I don't want to speculate but this accident reminds me of the Challenger 600 crash in Teterborro.
Both very high speed rejects where the aircraft failed to get airborne because of some sort of issue.
Of course now we know the reasons behind that Challenger crash, and wonder if something similar happened here. Could a G IV be loaded in such a way as to prevent a normal rotation at Vr?