我准备用Silverlight 4.0开发一些应用，4.0是因为要摄像头，我就搜搜release date吧。。。然后就乐了。。。
这个回答真逗
But let's speculate a bit. :-)
I think spring 2010 is the moment of the 4.0-versions. And I think that it would be in march. Visual Studio 2010 with .NET 4.0, WPF 4.0, WCF 4.0, CLR 4.0, Silverlight 4.0 and so on... maybe also Expression Studio 4.0? No, I think Expression Studio 3.0 lives a little bit longer with a Service Pack to make e.g. Blend working with 2010-Projectfiles.
What do you think/speculate?