Red Hat Enterprise Linux 7 Beta 1 is based upon the Fedora 19 package set and the upstream Linux 3.10 kernel. Today's beta release is for soliciting feedback on RHEL7 from the general public after its been in development now for quite some time: they were soliciting RHEL7 ideas back in 2011.
Red Hat Enterprise Linux 7 is said to be using the GNOME 3 classic mode for its desktop and it features support for Linux Containers, improved performance management, physical and hosted in-place upgrades, file-system improvements, improved networking, new storage capabilities, improved Windows interoperability, and greater subsystem management.
Many more details on Red Hat Enterprise Linux 7 Beta 1 are available from the RedHat.com press release. I'm in the process of downloading RHEL7 Beta 1 to check it out and potentially deliver some benchmarks. Look for the official Red Hat Enterprise Linux 7 release in 2014, but it's great to see this public beta out in time for the holidays.