The third runway at SEA
should be built by 2010. Although there is a lot of lawsuits from the cities boarding the airport and now recently the state has joined the lawsuit to stop the airport runway building it looks like it will be built sooner are later.
You should see how much earth they had to move to build the new runway. It is amazing.
There was a article posted in Sundays edition of the Seattle PI
concerning the third runway and it should not be delayed any further. http://seattlepi.nwsource.com/opinion/132853_portpro03.html
The building of the third runway has nothing to do with the winter games in Vancouver but it will help the traffic coming into Seattle for the games.
To answer your question in short.....The runway is being built no matter how many lawsuit are being made to stop it!