If you have HotS installed on your Battle.net, you might have noticed a small ~100mb patch this Tuesday evening.
The update was undocumented, but thanks to diligent Redditors, we know the details.
It wasn't some balance changes or new content, but also far from being insignificant, on the contrary.
Within those 100mb were some crucial fixes that finally sorted out some old, but also some recent bugs.
Azmodan's Q was slower when you were using Azmodunk skin, which was a shame. Arguably, that was one of his best skins. You can compare the now-fixed difference in the GIF below.
Samuro's level 7 talent Phantom Pain isn't OP anymore(due to bug), and it now works correctly. You can read more about the fixed bug here.
Xul, in the most recent balance update, got a powerful rework focused on his Skeletons, but it also came with two bugs that are now fixed and work properly. Skeletons no longer explode twice, and Skeletons spawned from Spectral Scythe, and Jailors no longer count towards your cap.
Finally, a really old Mal'ganis bug on his level 1 talent Winged Guard is also fixed, and it now won't allow you almost permanent 75 Physical Armor.