Submitting this as a bug report because it works in 4.7 and I saw no mention of it in notes
Easy to reproduce, just set up a camera shake like you normally would in Blueprint using Client Play Camera Shake, target set to get player controller, scale 1, Play Space set as User Defined, and then enter whatever you want into User Play Space Rot.
It works as expected in 4.7, but doesn’t appear to do anything in 4.8.