From Microsoft, SSDT is now available for SQL Server 2014:
We’d like to announce the availability of SSDT that supports SQL Server 2014 databases. SQL Server Data Tools for SQL Server 2014 CTP2 is pre-release software, does not support upgrade from an existing SSDT install or upgrading to any new versions of SSDT to be released, and should be installed only on a clean machine. This toolset should not be used against production SQL Server databases.
We have started implementing support for new SQL Server 2014 objects, but we have a few known issues:
We appreciate all feedback and encourage use of our forum or Microsoft Connect site. We would especially appreciate any feedback on the use of our tools against SQL14 databases and the new features. If there is anything that is not working as expected or producing incorrect results, please let us know so we can address high priority issues before RTM.
Run or download SSDTSetup.exe from http://www.microsoft.com/en-us/download/details.aspx?id=40850. We will not be providing ISO images for this release. Alternatively, you can create an administrative install using the instructions on the download page.
SQL Server 2014 CTP2 only supports the following languages: English, German, Japanese, Spanish, and Chinese (Traditional).