SharePoint 2013 Service Pack 1 has been released (re-released). Note that while Service Pack 1 does support Windows Server 2012 R2, Windows Server 2012 R2 support requires a new SharePoint 2013 with Service Pack 1 ISO to be released. Slipstreaming or installing RTM and then SP1 on Server 2012 R2 is not supported.

Foundation: http://support.microsoft.com/kb/2880551

Server: http://support.microsoft.com/kb/2880552

Project Server: http://support.microsoft.com/kb/2880553

Foundation Language Pack: http://support.microsoft.com/kb/2880555

Server Language Pack: http://support.microsoft.com/kb/2880554

Office Web Apps: http://support.microsoft.com/kb/2880558

Office 2013 Client: http://support.microsoft.com/kb/2817430

List of Server Updates: http://support.microsoft.com/kb/2850035

List of Client Updates: http://support.microsoft.com/kb/2850036