no one knows for sure, I'd be surprised if we don't see an update in september. Probably an internal speaker for all the 3rd party apps that use sound. And at the same time we're likely going to see the 16gb become the low end model and the 8gb discontinued, as well as the 32 coming down to $400. Doubt we'll see a 64gb but anythings possible. If you do buy now, I'd recommend getting a refurbished one as they're only $200 for 8gb and $300 for 16gb. So most likely if you wait your going to get the same price as refurb, higher resale value, and probably some new features. So unless you need it, I'd wait.
Good luck