In a couple of hours, the Symfony Live event in Paris is going to start. You can expect Fabien Potencier to release Symfony 2.0 at the keynote he is holding on March 3rd at 17:30.
This is actually not a big deal since Symfony2 has been around for a couple of months. The big question is, should you already start developing your next project with Symfony2? There is no definite answer to that but what you can expect is a “not so much” changing API and already robust Framework right from the start. If you are planing a big project with longer time to develop, Symfony2 is a must. If you have already started and use Symfony1.4, stick with it.