ive been reading up on it more and it looks like here are the key differences ive found:
*due to the proximity sensor change with the i4 black vs. white, there are larger cut outs in the front so that a single case can accommodate both the black and white 4s. cases that are fully open in the front will have no issue with the front of the 4s. any case that works for a black i4 will work for a black i4s, as well as any case that works for both colors i4 will work for both 4s.
*updates to the quality of the camera and its sensitivity creates degraded images (even if ever so slightly) when the back of the case surrounds the camera and flash openings like tunnels as seen on the old i4 otterbox cases and the seidio. cases that have a larger opening that does not perfectly surround the camera or flash will have no issues with the front of the 4s.
again this is just what ive read, but it makes sense. you just need to be aware of white iphone compatibility, but you can use the old cases that surround the camera if image quality is not a tremendous deal breaker for you.
*due to the proximity sensor change with the i4 black vs. white, there are larger cut outs in the front so that a single case can accommodate both the black and white 4s. cases that are fully open in the front will have no issue with the front of the 4s. any case that works for a black i4 will work for a black i4s, as well as any case that works for both colors i4 will work for both 4s.
*updates to the quality of the camera and its sensitivity creates degraded images (even if ever so slightly) when the back of the case surrounds the camera and flash openings like tunnels as seen on the old i4 otterbox cases and the seidio. cases that have a larger opening that does not perfectly surround the camera or flash will have no issues with the front of the 4s.
again this is just what ive read, but it makes sense. you just need to be aware of white iphone compatibility, but you can use the old cases that surround the camera if image quality is not a tremendous deal breaker for you.