Actually, that's not necessarily the case as the date for IZ is the later of Sept OR the Minister approving an MTSA. As of now, Toronto hasn't shown delineations for Steeles or Cummer so seems unlikely to happen by then (though developers might not be hedging their bets).
I've mentioned this on the YNSE thread too but the forthcoming Secondary Plan for this area and inevitable up zoning, along with finally some certainty about the subway, timing, are likely bigger factors.
The City has initiated a planning study to develop a vision for the future of the Yonge Street corridor between Finch Avenue and Steeles Avenue in response to existing and anticipated development pressures in the area. The Study will be undertaken in the context of the existing Provincial...