EDIT: I just figured it out. As it happens, toggling the X-ray outlines is accomplished by--get this--pressing the X key.
First off, it looks like the devs have done a lot of work on fixing the History tool. So far, all my matches on the CET have been recorded in full, which is alone a fantastic fix. The controls seem more consistent, too. In all, it's great progress, so thanks to the dev team for that!
One thing that is new (maybe just new to me) is color-coded "x-ray" outlines of the players so you can keep track of everyone's position at all times. That's a pretty cool feature, but I'd like to be able to turn it off. Does anyone know how to do that?
I'm excited about the new patch - so far, it looks like we're going to be very happy with it. I know I am!