The Pandemonium (Delirium #2) by Lauren Oliver cover was revealed recently. They’re going for a different look this time. It’s similar to the special edition of Delirium, which will be released in August. It has the first few chapters of Pandemonium in it, so look out for that!
If you’ve not heard of or read Delirium, I recommend it. It’s one of my favourite YA dystopias so far.