On 22 of April 2014 Microsoft released the first cumulative update for SQL Server 2014, see http://support.microsoft.com/kb/2931693.
If you are thinking of migrating to 2014, but don’t want to be the earliest adopter – now you have a slightly better 2014 version to go to. Could make that decision a bit easier to make.
If you follow the link you can read for yourself in the KB article which issues has been addressed in the CU1.
As usual you should proceed with care and test your application before deploying a new version to your production environment.