Erlang/OTP 17.0 is a new major release with new features, characteristics improvements, as well as some minor incompatibilities. See the README file and the documentation for more details. Some highlights of the release are:  * Maps, a new dictionary data type (experimental)

• A more natural mapping from ASN.1 OCTET STRING and BIT STRING to Erlang types, and other ASN.1 improvements and optimizations
• The {active, N} socket option for TCP, UDP, and SCTP
• A new (optional) scheduler utilization balancing mechanism
• Migration of memory carriers has been enabled by default on all ERTS internal memory allocators
• Increased garbage collection tenure rate
• Experimental “dirty schedulers” functionality
• Funs can now be given names
• Miscellaneous unicode support enhancements
• A new version scheme for OTP its applications has been introduced

You can find more information and download the release at the download page.