When looking at the wreckage this appears not to have been a very high energy impact.
The exact wreckage pattern is difficult to dtermine from the pictures seen so far, however what can be seen seems to point towards some kínd of rotation/cartwheeling upon impact. It does not really look like a fast straight- in crash.
Therefore, the likelyhood that some kind of aerodynamic stall was involved here appears to be high when looking at the wreckage.
Banking heavily left and right also matches a typical behaviour in stalled ATR's.
The exact reason for the stall will only be descernable from the FDR/CVR especially based on the respective speeds and loads.
Going by ATR's history however, it would not exactly be the first case of an iced over ATR biting the pilots.