There were a few additions to the 1.4.0 PTR Patch, including one hefty nerf to the Zerg Infestor.
Infestor's Neural Parasite can no longer target Massive units.
StarCraft II Editor Improvements
Custom maps with dependencies containing trigger libraries will now load significantly faster in the editor.
Fixed an issue where at the end of a replay the leaving player's Average APM would set to 0.
Fixed an issue where Bunkers would not display their refunded minerals to the owner or allies when they are salvaged.
Fixed an issue where Broodlords on the high ground would not be revealed when attacking enemy units on the low ground.
StarCraft II Editor Bug Fixes
Fixed an issue where closing the editor while the previewer is recording would crash the Editor.
Battle.net - Patch 1.4.0 PTR Notes