Some highlights of the release are:
 

• gen_statem a new state machine behavior
• mnesia_ext: plugin of external storage solutions to mnesia
• crypto: uses EVP interface in OpenSSL resulting in generally better performance and support for HW acceleration
• ssh: performance improvements, uses the new gen_statem behavior
• ssl: enhanced error log messages
• dialyzer: the support for maps is very much extended both the type specification syntax and the type analysis.
• erts:
  • erlang:open_port(spawn, ...) 3-5 times faster
  • tracing, extensive improvements (scalability, speed, match specifications on send/receive, support for lttng, ...)
  • dirty schedulers improved
  • per process configurable handling of message_queue
  • fast loading of multiple modules
  • max_heap_size process flag
• erts/kernel:
  • Experimental support for Unix Domain Sockets
Example: gen_udp:open(0, [{ifaddr,{local,"/tmp/socket"}}])
• and much more ....

You can find the Release Notes with more detailed info at

  http://www.erlang.org/download/otp_src_19.0.readme

You find the source code at github.com in the official Erlang repository.

Git tag OTP-19.0

https://github.com/erlang/otp/tree/OTP-19.0

You can also read the documentation on-line here:
(see the Release Notes mentioned above for release notes which
are not updated in the doc, but the new functionality is)

http://www.erlang.org/doc

We also want to thank all of you that have contributed with new features, bug-fixes, suggestions and bug reports.

The Erlang/OTP Team at Ericsson