Microsoft banking on Managed Extensibility Framework (MEF)
Microsoft is hiring Verissimo de Oliveira, the founder of the Castle Project, which has one of most popular Dependency Injection (DI) frameworks for .NET, Windsor.
From this eWeek article:
In addition, Microsoft's hiring moves have reflected a move toward more "open"-minded individuals. For instance Hamilton Verissimo de Oliveira, founder of the Castle Project, recently said he will join Microsoft as project manager of the MEF (Managed Extensibility Framework) team. MEF provides developers with a tool to easily add extensibility to their applications and with minimal impact on existing code.
I would say Microsoft is serious about DI, no?