"I hope, soon we will see new manual about this."
There are reasons why PHP v5.4 and v5.5 are not in the main CentOS repos yet (namely, security). So, unless there's a specific project that you're working on that requires a more recent version of PHP, there's some risk, w/o much incentive, to using the newer versions.
With that said, RPM and Ubuntu LTS are sometimes criticized for being overly cautious and, thus, too slow in adding newer versions of programs to the official repos. In the end, just make sure that when going outside of the main repos, you keep an eye out for any security concerns that you may need to patch or watch out for.