Maybe you know, Microsoft have started developed Visual Studio 2010 and .Net Framework 4.0 for more than one year.

I am pretty sure Visual Studio 2010 will be very successful especially Microsoft gain lots of experience on Expression product family.

They published what will be in .Net Framework 4.0 Beta 1, so it's mean we will use this features when .Net Framework 4.0 publish.

vide : http://blogs.msdn.com/bclteam/archive/2009/05/22/what-s-new-in-the-bcl-in-net-4-beta-1-justin-van-patten.aspx