The 'S' key will no longer control toggling sound on/off. This can now be done with the F10 Key and the 'S' can be used to activate the shield.
Sound toggle key changed
Source: Steam Community (opens in a new tab)
Build and release context
Steam update times within 24 hours of this post. Matching dates do not confirm which build it describes.
Build 7628363 · public branch
Steam updated · First observed