Database development tools are now covered by SQL Server team. "Juneau" should be available in the next release of SQL Server CTP (2) called "Denali". Database development tools already available in VS2010 will be converted to "Juneau" when SQL Server "Denali" will be RTMed. All functionalities available right now will remain or will be enhanced. TFS branching and build will continue to work. So, for now, it's business as usual. But I can't wait to get SQL Server Denali CTP2 to further talk about it.
Here is the Microsoft link to find more information's on it.