Terrain Editor
- The Instance List of Terrain Editor now have a Group dropbox, which would allow you to show pre-placed objects in specified group only (you can define pre-placed Object Groups in Map menu)
- Add a Force Occlusion Hide flag for pre-placed doodads.
- Water palette now have a Height slide bar, allows you modify the Water height easier (Doesn't have to open the Water Editor).



Renee2islga AuthorBeta Patch 2.0.1 introduced more Editor features.
Here is just a feature list and short descriptions of what I found. And it would be bit long. Please remember the Heart of the Swarm is still under development, so I believe blizzard would add more features in future.
http://www.sc2mapster.com/forums/42797
General Features
Bug Fix
Beta Patch 2.0.1 finally fixed most of the long standing editor bugs, for more information, see
http://us.battle.net/sc2/en/forum/topic/6398669960
Page Link
In the new Battle.net interface, you can copy link of certain pages in-game to the clipboard. This include map info pages. So you can copy a link of your map, and give it to other player. Clicking this link would navigate the player to your map info page (If SC2 isn't running, it would launch the StarCraft II first, the player still need to enter name/password to login though).
For example, this link launches you to the game info map of "NewKirk City" map (You need to have beta acess of course)
starcraft://map/98/1121
The only problem is I didn't see a Create Game or Join Game button in this page, we really need this! I guess blizzard just haven't added them yet, or these button would for Arcade Games only?
Custom Interface for OB
In 2.0.1 editor, you can create StarCraft II Interface Files. To do it you need to create a Mod and save it as .SC2Interface file. You can only customize UI layouts in Interface files, and can't have any trigger or data part in it.
I found that in beta game there is an Observer Interface dropbox in Options->Gameplay sheet. Which I believe could be used determine the .SC2Interface file you want to use when play as OB or watching Reps. I guess it's a bit like the Add-ons in WoW. Just haven't found out where you should put the .SC2Interface file to in order to allow the dropbox detect them. Tried put them under "Maps\", "Mods\" and "Interface\", doesn't seem to work though.
Physic & Ragdoll
Beta Patch 2.0.1 add many Ragdoll death models with full physic bodys, let start to explode Marines!
New Game Attribut
A new Game Attribute added: Game Privacy, allows map maker and players to decide if the Game would hide Build Order and Match History.
New ability stages
Two new ability stage added: Bail and Wait.
New Editor Icons
Some editor button and elements got new Icons.
GAx3 - An A extremely powerful Mod to amplify the capability of StarCraft II Editor!