Some new features:
Animated emoticons support.
Global channel favorite/bookmarks system.
Reverse color control support.
Nick icons in messages.
Improved scrollbar support for Monitor Panels (both horizontal and vertical).
Improved SSL/TLS validation.
Many new triggers/filters for Highlights/Ignore/Nick colors and Nick icons.
Options dialog now opens much faster.
There is a new plugin which converts regular emoji characters to colored emoji icons in the plugins forum
See the changelog for more information.