Beta 4, (not 5), expired at exactly 7:00 am EST this morning. At 6:54 the alarm went off on the phone and when I hit snooze everything looked normal. At 7:03 the alarm went off again and it had a pink screen.
Good news - Alarm still works when you have the PSOD
Bad news - No way to turn alarm off when you have the PSOD, you can only keep snoozing.
I spent a frantic 35 minutes this morning downloading the beta 5, updating and activating the phone before grabbing external music drive, and laptop and racing off to work. Spent part of my lunch syncing all my apps and media back.