Apple released this update a day or two ago. I installed it yesterday morning.
Since then, I've had worse performance on transition to the SMS and contacts screen. I've also had issues when listening to music and receiving email/sms at the same time. Sometimes the music fades out and then stops, and I need to tap the round button at the bottom to make it go again, sometimes the music just halts (no fade), I head the new email sound, then music starts up again.
I've noticed nothing good about this update.