Found a site plan of this development from the environmental impact study
Looks like the first three buildings will be 12s/8s and the last building will be 9s.
It also appears that the base of each of the buildings will feature townhouse-style units.
The entire south side of Southdale in this area will be very transformative in the coming years between this proposal, York's high-rise subdivision by the Bostwick community centre, as well as more apartment buildings currently being constructed to the west of this site.