John, the rumours involve both .Net and Silverlight. Another announcement - supposedly clarifying what was said at the D9 conference - is due from Microsoft in September, I believe.

Here are a couple of relevant links. As you might expect, the .Net/Silverlight developer communities are not happy.

https://forums.silverlight.net/forums/p/230502/562077.aspx

http://techbrij.com/674/windows-8-dotnet-html5-silverlight