BBC has posted the first hands on video with the 4S which can be seen below. Engadget also got a few minutes with the Sprint version of the device and had this to say:
We were able to spend a few quality moments with the refreshedhere at ’s campus, the Sprint flavor no less, and as you might expect… it’s an . But S-ier. Much in the same way that the 3GS improved the overall experience of the 3G, the 4S does likewise compared to the existing 4. The dual-core A5 chip is a laudatory improvement, and whisking about pages, loading the camera application and launching — well, just about everything — just feels zippier. As it should. The other major change, the antennas, weren’t readily different at a glance, but as Mr. Cook stated, you’d have to be iFixit to notice (and we’re sure they will).