Indeed.... The book starts out like they all do: on or around Harry's birthday.
His blood protection expires when Harry turns 17, at the stroke of midnight, as Voldemort must know. Number 4 Privet drive is no doubt scheduled to become a smoking crater at 12:01 am on July 31. Harry survives, of course. But I suspect that one or more Dursleys don't.
Maybe Aunt Petunia will finally out herself as a witch. Heehehee