TeX Live 2018 was released on 28 April 2018.
I waited some days until I did the update (and to write here) to see if there might be any issue regarding setup or function. A few points were posted on the TeX Live mailing list but are usually already fixed. You can read or write there in case of any suggestion.
Besides maintenance there are updates to the various TeX engines. Most notably, luatex53 (based on lua53) has been added. Though the standard luatex now requires glibc version 2.14 – I had an older version on the older Debian system I was installing on first, so an update of libc6 was needed.
The TeX Live Manager (tlmgr) now comes with a shell (tlshell) for scripting and a Java based graphic user interface, the TeX Live Cockpit (tlcockpit).
For information, download, and documentation, visit the TeX Live homepage.