With attendance limits currently preventing some Canadian teams from packing fans into their home arenas, the NHL has made some scheduling decisions, postponing several of these games so that they can happen at a later date to try to be proactive to ensure that revenues aren't impacted more than they already have been.
Per David Alter (The Hockey News), the NHL has postponed the Leafs' January 17th meeting with the New Jersey Devils that was set to take place at Scotiabank Arena in Toronto. At this point in time, the league did not have a makeup date set.
It's unclear what the NHL has planned for the Leafs' next home game against the Anaheim Ducks on January 26th. They're probably just playing things by ear right now to see whether or not attendance restrictions will be loosened or lifted over the next couple of weeks, which seems unlikely.