Microsoft has rolled out Team Foundation Server 2015 Update 4 Preview. The release candidate build contains around 25 bug fixes and is possibly the last update that is being delivered to the software.
Team foundation server 2015 RSS
Microsoft has announced that Visual Studio 2015 will be released on July 20th along with Team Foundation Server 2015 and .NET 4.6; the company will host a live Q&A the same day as well.