Some of the UI changes include an easier system for making use of workbenches, the addition of slash commands and macro functionality for abilities, and a new method for determining the direction of strikes in combat. Players will also have access to new combat skills, new out-of-combat skills, and a rebuilt taxation system.
The update also contains several bugfixes, but the patch notes warn players that the large update will be a bumpy ride at first. Players are asked to petition the customer support team only when absolutely necessary. But even with the likelihood of bugs, there's a lot for Mortal Online players to appreciate in this expansion.
[Thanks to Chris for the tip!]