The draft plan has been posted. They've changed the name to "Ottawa Centretown: A Community Design Plan for the Heart of Centretown". It's a 51MB PDF.
The post on the Mid-Centretown blog with the report link is:
The Draft Community Design Plan is Available!
You have until
JUNE 13, 2011 to provide feedback.
There will be a final open house on
JUNE 29, 2011 at the Museum of Nature.
They're proposing revised zoning that would allow 27-storey (83m) towers in a "Residential Apartment" zone from roughly between Cooper & Somerset up to Gloucester.
They're also proposing zoning for 77-metre towers in an area along Catherine Street.
If you want to see the zoning, it's on page 107 (page 111 in the PDF).