Please pay no attention to the heading, I will brief you on the timelines and the sort.
I am also using a numbering system of routes that have not yet been established. I have assumed that the LRT will number its routes in a x00 range that has not already been claimed by Strathcona County Transit, St. Albert City transit and Edmonton Transit. This leaves the 300-399 range clear and thus I have used it for this demonstration.
The 301 (the current line) goes from Clareview to Health Sciences. The connection to Southgate will open in 2008 and the Century Park line will open in 2010-2012.
The extension of 301 will probably be built after the 302 and the 303 lines are built.
The 302 or the 303 line will be debated on which will be going first. The biggest stumbling block for the 302 is that it goes through some wealthy neighbourhoods along the river valley. This may or may not delay the construction of the LRT, but may increase costs from what they might otherwise have been less expensive. Assuming the 303 is built first (since it is the shortest extension), it will probably start construction in 2013-2015 and be completed by at least 2017. If the 302 is started first, it will begin construction within the timeframe of 2013 to 2015. It will probably be completed as late as 2020, but could be fast-tracked to 2017.
After that, the lines described are pretty much hypotheticals and may take another 50 years to build after that. But once 2020 rolls around, those three lines should be finished and be serving this city a lot better than it currently is.