I found this website http://www.rabbitears.info with listings of digital stations including Toronto and some other Canadian listings. They are listed in order of U.S. market size. Buffalo and Toronto are #50. Rochester is #78. Vancouver is listed under Bellingham #14. This page has links to official FCC reports for some stations, mostly the ones flash cutting or changing channel. [Link: rabbitears.info]
The most interesting bits for us are:

WPXJ DT ION 51 53 23 905.' 455. kW DA 20080219AYG Will halve analog power 06/01/08, then flash-cut on 02/17/09. (ed: switching to 23 -go to page and click FCC link for details)

WNGS DT RTN 67 47 07 1348' 15.5 kW DA 20080207AOA Will retain current service until 02/17/09, and will then switch to DT-07

WHEC DT NBC 10 58 10 502.' 30.0 kW ND 20080212ACD Will reduce power around August 2008.
WHAM DT ABC 13 59 13 499.' 10.5 kW ND 20080219AIW Will flash-cut on 02/17/09

WPXJ and WNGS are not going to use their transitional channels. 58 and 59 Rochester are going to be switched overnight to 10 and 13. No simulcast period.