The changes list is below, starting from last release (1.54w RC2):

+ Gladiators now can use bows much more effectively, damage done with bows is based on the following formula now: ((STR*CLVL)/75)/2;
+ Hidden will now sometimes pop up from Cryptic urns and sarcophagi (only Hidden, Illusionists don't hide like that);
+ Sneakers, Shadows & Shadow Weavers will sometimes pop up from Catacomb barrels;
+ Abyss pods will sometimes contain Blood Legion;
+ Catacombs will now render more relicts and books by creating Ancient Tome rooms;
+ Grapterra: lower chance for retreat, but higher damage;
+ Adjusted/improved/added flip- and inventory sounds for chainmails, runes and lite shields;
+ Leather Cap and Fool's Luck: new flip animation and sounds;
+ Cuthur: maxdamage raised;
+ Quake Lord renamed to Hell Minion;
+ Burning crosses will now cause damage;
+ DLVL 24 monster seeding sizes adjusted (now there will be 3 types of monsters there each time, which makes the game look and feel better);
+ Added 7 new bosses to DLVL 24 pool (various attack types, new colors);
+ Thunder Lords become fire resistant on Horror/Purgatory modes (used to be immune), on Hellmode they will still be only vulnerable to magic damage;
+ Soul Hunters (hidden type) renamed to Bone Creepers;
+ Ravakh the Crypt Baron renamed to Doomfang Bloodgutter
______end of log_____

Some of the above changes may sound short but the amount of work done is not. There is a lot to do. And more will come along the way (I got no doubt about that). This release just brings more stability (bugfixes), more fun, more variety and more challenge. Plus some things that might really surprise you. Not all of the changes I did were documented.

Enjoy.

And beware.