We are happy that we can announce that the April CU is now available. Please check carefully (different prerequisites) the blog post from my colleague Stefan Gossner:

http://blogs.technet.com/b/stefan_gossner/archive/2013/04/27/april-2013-cu-for-sharepoint-2013-has-been-released.aspx

BTW: It contains as well the hotfix I am mentioning here February 2013 SharePoint 2010 Hotfix and the fix is now available for SPS2013 with April 2013 CU.