While the map labels it as "Express corridors" in other documents it is referred to as "priority corridors" where additional infrastructure such as queue jump lanes could be installed. I would not necessarily take that as an indication Eglinton will receive express service, being very close to the transitway.
February 22, 2021 service changes
Route Changes
44 - long term detour routing due to watermain construction on Mississauga Road. Detour via Burnhamthorpe, Erin Mills, and Eglinton. Schedules will be revised to accomodate the detour and buses will serve all stops along the detour routing (note: will not service Erin Mills Station)
53 - extended to Cooksville GO Station via Hurontario Street. Route will access Cooksville GO via Hurontario entrance and exit via Hillcrest. Deviation to Paramount Centre during off peak periods is eliminated. Slight changes to frequency to accommodate revised routing.
70/71/108 - routes changed to no longer use 60' buses with 40' buses used at all times.
Additional COVID service changes
29/36 - Will use Saturday schedule on weekdays (30 minutes frequency all day). Route 29 and 36 will interline.
43/87 - Reduced from 22 to 45 minutes frequency. Routes 43 and 87 will continue to interline.
109 - Weekday rush hour frequency reduced to 15 minutes.
In addition to the above, the usual minor trip/schedule changes to various routes.
https://www.mississauga.ca/miway-transit/service-changes/feb-22-2021-service-changes/