Structurally, the Leafs played their (new) game, and the Habs just either let them or couldn't do anything about it. The neutral zone was free range for the Leafs to rip through with quick short passes, skaters zipping through on foot, or a (more) rare stretch pass springing a winger at the blueline.
On regroups, Leafs D were fast enough on the pucks that they could skate to their own blueline and fire an easy pass along the wall to a waiting winger at the redline corner, who then sprung his speeding centre with a lateral pass, leading to a pretty good chance at entry. The puck always had two Leafs nearby, either to steer a retrieval or to support an incursion up the ice. On the rare occasion they got the puck back, the Habs could not do much more than try to rip long shots from the point and hope for a lucky bounce.
It's just preseason, but there are very positive signs. After the first 10 minutes, the Leafs played hard, fast, and generated waves of chances.