You can download SQL Server 2014 CTP version from – http://technet.microsoft.com/en-US/evalcenter/dn205290.aspx
You can get the more information on SQL Server 2014 from http://blogs.technet.com/b/dataplatforminsider/archive/2013/06/25/sql-server-2014-public-ctp-now-available.aspx link
SQL Server 2014 only support x64 bit architecture.
