This update offers performance improvements for huge games, new spells, more modding commands as well as a few new features and bug fixes. One of the more noticeable new features is that the map will now be drawn as snowy during winter if you don't know the actual temperature of the province (likely a better guess).
General
New arena fights (2 different and foreseeable by fortune tellers)
New unit: Orphic Mystic
New spells: Bind Keres, Curse Tablet & Seith Curse
Unknown map parts shown as snowy during winter
Ctrl+t to setup army for selected commanders only
Better performance in army setup for very large armies
Lightning bolts weren't drawn when they hit an empty square
Fix for battle with 10000 soulless hanging the game
Random map creation multithreaded
Winter overlay didn't work properly for very large maps
Cataclysm shown in Thrones of Ascension box
Cataclysm setting shown among other game settings
Immortals try to never rout
Out of ammo archers didn't attack
Sound effects slowdown during time stop
Units always face proper direction when striking
Red coloring of orders now take Power of the Spheres into account
Turn number shown in season popup
Improved stat info
AI item distribution improvements
Fire shield never works under water
Mercenary bidding box supports shift for +/- 10
Same start of message for castle battles regardless of defender/attacker win
Curses shown on commander tokens
Curses show when holding Tab on army setup screen
Fix for unique monsters & Lord of the Hunt aging every turn
Pluralization fix
Stat fixes and tweaks
Typos fixed
Modding
Using default flag with different color didn't always work
Spell modding: #friendlyench, #hiddenench, #onlycoastsrc,
Spell modding: #nocastmindless, #spellreqfly, #onlymnr
Spell modding: #polygetmagic, #nextingeo
Nation modding: #aicheapholy, #homefort, #buildfort
Nation modding: #builduwfort, #buildcoastfort, #nationinc, #aiholyranged
Nation modding: #halfdeathinc, #halfdeathpop, #noundeadgods, #domdeathsense
Nation modding: #uwallmult, #uwallcom, #recallgod, #forestlabcost
Nation modding: #foresttemplecost, #fortunrest, #riverstart
Event modding: req_nomnr, req_code & req_anycode can be used multiple times
Event modding: #inccorpses