There are many new improvements for the existing UI, better particle effects for heroes, and most of all a new map and game mode.
The new map is called Dire Tire and is the same current DOTA 2 map which has been heavily modified. Dire Tire will feature the new mode which has a Halloween theme attached to it so we can safely assume it’s release to be on the same date.
Other hints found in the patch breakdown points towards interactive candy pumpkins, glowing areas on maps and new animations for creeps.
The whole thing was posted by CyborgMatt, players can head on over there and go through the entire list.