The Queen now will start to attack you if you hold onto her for too long. So don't hoard her. :)
You can watch Devero talk about this change and more on our update here:
The rest of the changes are as follows:
//Release Notes 1.2.40
-Queen breaks subdue after sitting idle too long
-Queen now attacks closest enemy after subdue wears off
-Turrets will no longer fight queen after subdued
-Audio updates
-buildings base health increased