A circa-2014 site plan shows the new Southwest Wing (in medium gray), which was officially dedicated in late 2012. It added twenty-seven inline stores to the retail roster and included an expansion of the existing Holt-Renfrew. 

Work got underway in early 2014 on an eastern YORKDALE addition. Anchoring this is a newly-built Nordstrom, which was one of five Canadian stores open for business by late 2016. 
Drawing from www.yorkdale.com

YORKDALE CENTRE circa-2017. A vacant Sears (in medium gray) has been sectioned into inline stores, with half of the space going to a new Restoration Hardware. On the east end of the complex, most of the old Parkade garage has been knocked down. It has been replaced by a 298,000 square foot expansion (also in medium gray) that includes the aforementioned Nordstrom.