If this all sounds a bit familiar, that is because it is. Silverlight is simply the new name for Windows Presentation Foundation/Everywhere (WPF/E). According to the Silverlight FAQ, even the CTP is unchanged in everything but name. The only thing newsworthy at this time is the new Silverlight wallpaper.
Microsoft claims to be on schedule to deliver Silverlight in the first half of this year. But without even a beta available yet, let alone a release candidate, the timeline seems rather optimistic.