Look up Liquipel technologies. You have to send your phone to them to do it but they coat the inside of your phone with a nano film to waterproof the phone without needing a case at all. They don't even need to open the phone to do it so you still keep your warrantee.
Lifeproof is working on the case & the only thing they are saying is it will be available in the 4th Quarter (Oct-Dec)
They have a sign up spot on their website so you can be notified when it's available.