Unity confirmed today that their forums were hacked over this past weekend. Unity director of security Andreas Haugsnes issued a statement about the security breach.
2FA Authentication
2FA will enable you to use one time passwords tied to the Unity Authentication platform. This will also be enforced in forums.

Device Identification
Device Identification will alert and/or prompt you if a new PC or Mobile device tries to connect to a Unity service, with your credentials.

Password Policy

The hack originally came to light when Unity users said that they were receiving emails from Unity's account in which a group called OurMine claimed that they hacked the site and had access to a database of two million users. OurMine were at least kind enough to also inform people that they should probably change their passwords.