It is hard to say when it will go before the design committee - probably not until the federal government has committed funds to the convention centre.
A lot has been released regarding the design. This following document has floor plans showing room numbers, square footage, stairways, elevators, loading bays - essentially the entire convention centre layout on 8 levels -
https://conventioncentreinfo.com/wp-...id-Summary.pdf .
The rendering below looks quite detailed. However, Rank Inc. has indicated that the exterior can change after public consultations - so it has not been finalized. The public consultations can proceed as excavation proceeds - if it goes ahead.
The illustration below shows elevations and also shows how the Grafton Street Pedway/Ballroom Ceiling is supported with arches (this is part of the structure). This illustration was copied from this report -
http://www.tradecentrelimited.com/si...e%20Report.pdf - note that the image is cropped to make the numbers easier to read (it doesn't show the full height of the towers - but you can see them in the report).
The Rank Inc. website has other elevations, but some are of the old design -
http://www.novacentre.ca/
PS: $21 million of the $140 million estimated construction cost of the convention centre is for engineering design. Thus I don't think that the detailed design will be finalized until excavation is well underway - I can't imagine that much money being spent without a signed agreement from the 3 levels of government.