The Steam repository now contains the Steam client package plus the S3 texture compression library for Open Source drivers for CentOS and Red Hat Enterprise Linux 7.
The CentOS/RHEL repository contains also all the SteamOS session files and binaries for running a Steam-only system, like the Fedora ones. As the Fedora packages, the main client is 32 bit only, so when running on 64 bit systems, make sure to load also your 32 bit libraries if you are running on proprietary drivers or the S3 texture compression library if you are running on a 64 bit system. Work on Valve’s X-Box kernel module for CentOS/RHEL is ongoing; as in its current form there are unresolved symbols.
As part of the update, also the Fedora X-Box kernel module has additional fixes on top of Valve’s code.
I will also add the packages to RPMFusion when a CentOS/RHEL 7 branch will eventually be available.
For full details see the repository page.