Saddletowne and Martindale stations open for service on August 27th. Traditionally there is an opening ceremony on the Saturday before the revenue opening of extensions. This would be on August 25th, although nothing official has been announced for that.
Here's a link with some information about the opening and some of the bus route changes that will come into effect with the new stations. There will be two new routes, Route 71 Taracove and Route 159 Saddlebrook.
http://www.calgarytransit.com/html/s..._20120827.html
I've got all the new/changed route maps below.