Official patch notes here: [link]
These changes look pretty stellar for the map editor. It’s good to know that Blizzard has kept some focus on the editor, as it is an extremely important part in the longevity of the game.
Starcraft 1 had a pretty decent editor at release, but Brood War made it much better. Warcraft 3 had an amazing editor at release, and The Frozen Throne made it godly, capable of creating DotA. By the time SC2 was released, the vast majority of games played on Warcraft 3 were custom games.
It looks like Starcraft 2 is prepping its map editor for Heart of the Swarm. This is pretty exciting. As a WC3 map maker, I was planning to craft some things with the SC2 editor, but it was just too clunky compared to the WC3 editor. Since I didn’t want to spend too much time on it, I decided to wait till Heart of the Swarm or even Legacy of the Void to start working on maps.
With Patch 1.5 just in, I might give it a try right away… if I can get the patch to work.
Edit: Got the patch working. The new UI looks pretty neat.