The only thing they're really keeping is the design language, which has just (in the last probably 6-8 months) caught on. It's a little tired to S3 owners, but for everyone else it's not outdated. Everything else is updated. The screen is better (Apple has hardly changed its Retina display since it first appeared), the processor is much improved with better battery efficiency, the battery is larger, the camera is better, and there are some new software implementations. Just because the design language is the same doesn't mean it isn't a worthy upgrade. Plus, it doesn't make sense for Samsung to make huge changes to the visuals of TouchWiz when they'll probably overhaul it with the Key Lime Pie upgrade that will come a few months after the announcement to the S4. If I had an S3, I'd be salivating for the S4.