Announcement here: http://lists.centos.org/pipermail/centos-announce/2014-January/020100.html

I use Redhat because of its being certified for $DAYJOBs QAD Systems ERP software.

Elsewhere I use CentOS because I have always liked Redhats system-config-xxxx style of admin tools which provide a consistent admin experience.

Time will tell what the direction of the combined entity will be, but the stated intention in the announcement seems OK.