Some things that stuck out at me:

• map support in dialyzer (yeah 355E3B!)
• time/date of build no longer included in BEAM, so same machine will generate identical images when compiling (should allow smarter build tools)
• tentative support for Unix domain sockets (!)
• better IPv6 support for inet:gethostbyname/1.

Full changelog here–and might I add, that sort of attention to detail is why I have great respect for the Erlang devs.

Mnesia_ext support is amazing. You can use it to get around needing to write sql in most cases.

Also map support finally in dialyzer!