…besides the obvious, of course.
Naturally it put models for the various new units in, including the campaign-only mutations, along with the new sound sets.
- Were any radically new environment tile-sets added?
- How about models for units that were proposed but didn't make the cut (War-hounds, etc.)?
- Any changes/additions to triggers or other systems?
Edit: It's been suggested that, for completeness, we should list all the new additions, even the obvious ones like the new multiplayer unit models.
Best Answer
New Texture Sets
New Objects
This list is HUGE, so instead I will tell you how to find what items were added or modified. Open the SC2 map editor, and choose a new document. Select Arcade Map, Choose the Heart of the Swarm dependencies, Include Campaign Data. You can pick any map for this, it doesn't chage what models are available.
Hit F7 to open the Data tool. Right next to the search bar you can select your data source to narrow down the list of items it gives you. Choose Swarm.SC2Mod or Swarm.SC2Campaign to see the list of all items that were added or modified.
Editor Updates
All the HotS editor functionality updates and bug fixes were rolled into WoL as well, so there aren't any HotS updates that you wouldn't get in this category if you don't buy HotS.
However, there were a ton of updates made when HotS released.
General
AI Module
Cutscene Module
Data Module
Overview Manager
Terrain Module
Trigger Module