This from Green Party at riderfans.com
Spoke with someone who has seen the plans and both stadiums are going to be extremely impressive. I believe it will be a 2018 opening for the Stamps (so I am not sure if it will be 17-18 season for the Flames or 18-19 - I think it was 17-18). Flames new home will be a new standard for the NHL and will be able to accommodate some of the larger music acts that usually pass Calgary by . Stampeders will have a greatly increased capacity and will be comfortable at all times of year. Calgary will be a regular Grey Cup stop in the future. This will be an extremely exciting announcement!
And there is also this from Scott Mitchell of the Calgary Sun