Red Hat Linux was a distribution developed by Red Hat until 2004. The first version of the distribution was introduced on November 3, 1993 and the operating system it was originally called Red Hat Commercial Linux.
It was the first distribution that took advantage of the RPM package manager, and it was the basis for many derivative distributions including Mandriva Linux and Yellow Dog Linux.
2003, Red Hat has interrupted the development of Red Hat Linux and has focused on Red Hat Enterprise Linux (RHEL), which aims to support business and commercial applications. 
Fedora, developed by the Fedora Project community with support from Red Hat, is one free version suitable for personal use. Official support for Red Hat Linux 9, the last version of the system, ended on April 30, 2004.
Today, RHEL's development company announced the new beta version of the Red Hat Enterprise Linux 7.x series.
The new release, Red Hat Enterprise Linux 7.4 Beta, includes bug fixes and some new features for the 7.x product line.
“To help protect against the latest threats and provide a more secure platform for mission-critical applications, Red Hat Enterprise Linux 7.4 Beta introduces several new features better safetys, such as:
- Support for encryption of reserved network drives (Network Bound Disk Encryption), a tool designed to reduce the Disk Encryption management scale.
- Improvements to OpenSSL HTTP / 2.0, allowing the use of multiple TLS (Transport Layer Security) protocols in OpenSSL and Application-Layer Protocol Negotiation (ALPN).
- Up-to-date control features designed to help administrators filter out events recorded by the control system, collect more information from critical events, and interpret large numbers of files. ”
More information can be found in the official announcement of the issue and in the release notes. Downloads are only available through the Red Hat customer portal.
As for the rest, patience until the release CentOS the corresponding beta version.
Information from WikiPedia.
