Visual Studio 2013 has been released since late last year, but there have been no business intelligence tools available. If you wanted to build cubes, SSIS packages, etc. you were stuck using Visual Studio 2012.
The new Microsoft SQL Server Data Tools for Visual Studio 2013 has just been released.
As with the previous version, when you install the add-in, select the option for “Perform a new installation of SQL 2014” even if you have an existing database.