The 10k most commonly used passwords can no longer be used as passwords. While this change applies to all new accounts created, older versions of the extension will show you error code 10 instead of an error message.
You can now attach a 'tag' of up to 96 characters to chat messages. This allows you to, for example, implement local chat, custom team chat, or other chat features that require more data than just a plain chat message. Chat messages accompanied by a tag are currently not subject to filtering, muting or slow chat mode.