Apparently public consultations are planned to start soon. See:
https://www.toronto.ca/services-pay...city-facilities/union-station/northwest-path/
They are looking at 4 possible routes:
Alignment #1: York Street
This is the preferred alignment from the 2008 EA. It travels north from the end of the existing Contract 1 tunnel, following under York Street to Wellington Street. It connects to the existing PATH system at 100 Wellington St. W. and/or 70 York St.
Alignment #2: Front Street
This alignment will travel west from the Contract 1 tunnel, crossing the Line 1 Subway, and continuing west along the north side of Front Street. It will connect to the existing PATH network at Simcoe Place via a new development and concourse at 160 Front St. W.
Alignment #3: Building Alignment
This alignment travels east from the Contract 1 tunnel into the Royal York Hotel concourse level. A new connection will be built from the concourse, north under Piper Street, linking up to the existing PATH system at 95 Wellington St. W.
Alignment #4: TPA Parking Lot
This alignment will travel northwest from the end of the existing Contract 1 tunnel, travelling north along the east side of University Ave., re-purposing a part of the existing underground TPA parking lot. It connects to the existing PATH system at 55 University Ave. and/or new connections to 40 University Ave. and 70 University Ave.
Selection Process
Upon completion of a multiple criteria evaluation in line with the existing EA, one preferred alignment will be selected for further design refinement. Design options will evaluate building connections and routing in more detail to determine how to minimize construction related impacts to landowners, PATH users, and others in the area. The Municipal Class EA Addendum process will continue into mid-2018 with construction anticipated to commence no earlier than 2020.