You can check out more info on how to get up and running on the Silverlight site: http://silverlight.net/getstarted/default.aspx.
You can also check out Tim Heuer's blog here: http://timheuer.com/blog/. He's got some great links on where to get tools/SDK and also some of the changes to expect with the up and coming with the new version.
Now it's time to update all of those Silverlight and SharePoint integrations you've been building! :-)