The betting markets have stayed in the 48-55 range for Brexit by year’s end, even after the suspension announcement. That to me does not sound like “hard Brexit hell or high water.”
I would sooner think that Boris Johnson wishes to see through a relabeled version of the Teresa May deal, perhaps with an extra concession from the EU tacked on. His dramatic precommitment raises the costs to the Tories of not supporting such a deal, and it also may induce slight additional EU concessions. The narrower time window forces the recalcitrants who would not sign the May deal to get their act together and fall into line, more or less now.
Uncertainty is high, but the smart money says the Parliamentary suspension is more of a stage play, and a move toward an actual deal, than a leap to authoritarian government.
That said, I still do not like either Brexit or the suspension.