Research the iOS 12 Jailbreak
If you're currently jailbroken or if you want to jailbreak a device at some point, you'll want to be careful with iOS 12.5.2.
There's a working jailbreak for newer versions of iOS 12, but it's unclear if it works with iOS 12.5.2.
If you still jailbreak your device, you'll want to check with the jailbreak community and see what your best course of action is.
Keep an eye out for new jailbreak details as we push away from iOS 12.5.2's release.