Air Canada have released their seat map for the B737-8 MAX. They'll be in 16/153 configuration with 30" pitch in economy and 38" pitch in business. For comparison, United's B752s are in the same configuration, albeit with full flat beds in business. The good news is that there will be personal TVs and wifi on board.
It's pretty much a LCC seat with legacy carrier service. Not the worst outcome really.
Air Canada 737 MAX 8 Seatmaps Revealed - One Mile at a Time