Here are some of the new features in Visual Studio 2005 for C# programmers (taken from MSDN website):

Automatic and Manual Conflict Resolution Tool
The Automatic and Manual Conflict Resolution Tool handles issues caused by multiple users working on different versions of the same file.
Atomic Checkins
Team Foundation Server enforces atomic check-in to help maintain the integrity of files under source control.
The Visual Studio 2005 Integrated Development Environment (IDE) includes Smart Tag support for auto-using statements.
Branching allows the creation of multiple similar code bases.
Bug List
With Visual Studio Team System (VSTS), you can easily find, track, and view bugs by using the Bug List report.
Better ASP .NET Source Code Editing
With the Visual Studio 2005 source code editor, Intellisense and new features for formatting, navigating and validating your HTML markup are available throughout your files.
Built-in SQL Server 2005 Express Support
You can develop and debug database objects for your application in Visual Studio 2005, even if you don't have access to SQL Server 2005.
Caching Improvements
Team Foundation Server is ideal for geographically distributed teams because of its server-based nature.
Check-in Notes
With Team Foundation Server Check-in Notes, administrators may collect data from users during the check-in process.
Check-in Policy
Team Foundation Server check-in policies provide a way for administrators to enforce development practices across a development team.

For these and any reasons which has made developing applications much easier in Studio 2005, I see the popularity of the languages in the .Net Framework growing, thus increasing their market share in the realm of programming languages.

I dont however see these languages touching Java, C++ due to portability.