This is just business as normal for Microsoft: they come up with a new framework and all they say for the next 6 months after launch will be "We've got NEW stuff, come and look at the NEW stuff, it's all NEW, see how NEW it is, it's so NEW".
You ask about the old stuff and no-one is interested in evangelising it. This is exactly what happened when WPF came out (no-one made new videos of WinForms stuff once WPF was announced, despite the face that it's still widely used).
This is just the development PR machine trying to drum up interest in the next new shiny bits. It doesn't mean the old stuff is lost, it just means that the excitable evangelists won't be talking about it.