A quick blurb about Regional Transit's Blue Line extension recently. They just received federal funding for the full phase 2 extension and work will begin in April, with an opening towards the end of 2015. This news in in addition to the work already started on the grade separations.
http://www.sacbee.com/2012/11/30/502...t-closing.html
And the initial Green Line segment opened a while back as well. The next phase will take it over the American River in the Natomas neighborhood and eventually to the airport, but that will be quite a few years out.