Several Silverlight-related releases were being published during the last week.
Expression Launch
The last released product in line of 2010 releases is the Expression set. Microsoft is going to announce it on June, 7th at Information Week in New York. The product will contain updated version of Express Blend and Sketchflow. The trial version can be downloaded from the official web site.
This release does not include any update for Windows Phone 7 add-in and is not suitable for Windows Phone 7 development. Continue using Expression Blend 4 and WP7 Developer Tools. See details here.
Silverlight 4 Service update
On June 3rd, Microsoft released the Silverlight update. This release fixes bunch of issues like Digital Rights Management playing on Mac and Windows, memory leaks, full screen mode on multi-monitor system etc.
It seems, since that release Microsoft started providing new versions of Silverlight using MS Windows Update mechanism. According to that change, huge number of computer with Silverlight 3 have been updated with Silverlight 4 release.
Developers should update their Silverlight developer runtime. The direct link to Windows version is here and for Mac is here.
New Silverlight theme pack preview
The Silverlight team has provided preview of a new Silverlight theme. This theme has dark tint and does not have official name. You can view a screenshot of the theme here. This theme is not available yet but you can download a set of previous themes here.