Montreal have drawn Mexican side Santos in the quarterfinal round of the CONCACAF Champions League [CBC writeup]. This wasn't the best draw for Montreal (Marathon of Honduras was the consensus best matchup), but UNAM and Pumas, other Mexican sides that finished first in their groups, are likely tougher.
Puerto Rico ended up drawing Marathon, which is the Pairing of Life (as opposed to a Group of Death). The full details of the draw are available on the CONCACAF site.
The Impact are still in negotiations to have their home leg played at Olympic Stadium. If not there, I'm at a loss as to where they might play. The match will occur between 24 and 26 February, with the away leg to follow between 3 and 5 March 2009.
Sadly, this is likely the next match of any importance in Canadian soccer. I'm not sure of the schedule for qualifying for the U20 tournament, but assuming that won't occur until the spring, I am confident in saying no important match will occur in Canada or with primarily Canadian players until this one. (As excited as I'll manage to get with our inevitable late January friendly against Montserrat featuring players like Carlo Corazzin and Jeff Clarke, it simply won't rank on the same scale).
The other team of note is the Houston Dynamo, the second most Canadian team in MLS. De Rosario and Onstad, if he's still alive by then, will play Atlante, winners of Montreal's group in the round robin stage.