The presenter for the development changes related to .NET and Windows 7 is ScottGu. Who else?
First off, Microsoft will be releasing a WPF ribbon control later this week. That is very nice, especially since the ribbon is the new hotness when it comes to the user interface.
Demos also mentioned the integration of touch and jump lists, which are Win7 specific functionality. The jump lists (which is context sensitive functionality available through the thumbnail for an application) are simply commands which are implemented and registered by the application. Touch integration includes the ability to tie gestures to commands. So, ultimately, commands become the main mechanism for integrating WPF and Win7, at least at this level.
Today, some additional WPF controls are being released. This includes DataGrid and a DataPicker control, as well as a Visual State Manager (a feature that greatly improves the creating of interfaces that depend upon events within the UI).
.NET 4.0 includes support for the dynamic language runtime.
VS2010 includes improvements for WPF designer. It also appears that VS2010 was built using WPF (at least the UI portion). Other areas of improvement include a streamlined test-driven development (TTD) model, and a better extensibility within the editor (and the IDE itself). For the later functionality, check out the Microsoft Extensibility Framework (MEF). The idea behind MEF is to allow for better visualization of data, even from external sources such as TFS, within the IDE. The demo includes the ability to grab bug information from TFS and display it while looking at the code associated with the bug.