Don't know what it'll be (obviously), but pumped. Why?
This is classic apple, and classically Apple at its best. Whether it's the use of small hard drives for the original iPod (or flash for subsequent ones), multi-touch, proximity sensors, and motion detection for the iPhone, or single-piece casing for the macbook, Apple likes to push non-mainstream technologies when it can use that technology to change the kind of experience a user has.
That is, apple doesn't push the megapixel count in cameras, or the hard drive size in laptops, because those give you a marginally better experience of the same kind, if they are noticed at all. Apple is usually behind the bleeding edge with such questions of specs. But when they can change a trackpad into a tool more useful than a mouse, when they can provide a laptop that feels full-fledged in a package that seems too light to be real (macbook air), or when they can get battery life that lets people forget about the battery, they push the bleeding edge as few have the muscle or will to do.
Curved glass isn't faster or statistically better. It's difference is in kind, not degree. To me, this indicates that Apple will do something unique and something disproportionately better. It's probably not revolutionary, but is more like the mag-safe power connector - only a power cord, but an improvement in experience far larger than you thought something as simple as a power cord could provide.