Here's an article from Urban Toronto about Cadillac Fairview's Sherway Gardens expansion. Could give us an idea of what the Rideau Centre will look like.
http://www.urbantoronto.ca/news/2012...herway-gardens
It's interesting that the mall will have both an expanded Holt Renfrew and a new Nordstrom. It shows that both stores could find a home at the Rideau Centre.