At Toronto City Council’s November 8, 2016 meeting, they voted to adopt a 47 ward system (toronto.ca) where previously there were 44 wards. Some last-minute refinements were implemented to keep some neighbourhoods together (for example, Regent Park would have been part of two separate wards). The changes will mean that ward sizes are more uniform – between 51,850 and 70,150 people by 2026 and will likely be in place for the 2018 election. The approved changes are subject to appeal to the Ontario Municipal Board (OMB).
This article provides a thorough overview of the topic:
Council to add three new members with ward boundary change (thestar.com)