MuscleNerd has just tweet a warning for unlocker just after releasing iOS 4.3.1 , he asks who rely on ultrasn0w unlock to stay away from iOS 4.3.1. Obviously for most users this is common sense, but I’m pretty sure that many people will press the update button.
Unlockers please stay away from today’s iOS 4.3.1! Just to be extra safe, so should future iPad2 jailbreakers (for now)
You can note that MuscleNerd also warn iPad 2 jailbreakers to stay away from updating to iOS 4.3.1 just to be extra safe at least for now.