Change log for 5.4 can be found on the wiki. 3 mods were added to add some new mobs as well as help those of us that need to see everything in our HUD via WAILA.
On a side note, I have restricted the ability to create/edit pages as well as accounts on the wiki until further notice. Admin can add people to it still, so if you want to help let us know. For whatever reason, and I will not jump to conclusions as to how or why although it appears very coincidental, the wiki got blasted by spam bots over the last week. Those of you that signed up for accounts…. sorry, life has been busy. You should be approved to edit it now.