If you are talking about features that are built into the S4 then I would probably say not many if any at all. I would think that Samsung MIGHT include some in a future build not all because then why would anyone upgrade if they don't care about the hardware?
I don't see the non-touch software being converted, I also don't see the camera features come to the S3 either. Those are the stand out features if you ask me and they will probably make them exclusive to the S4.
Honestly that is yet to be determined...the software that the S4 currently holds..it will be ported over the Galaxy S3 at some point..maybe not all the features will be ported but some of them will..from what I read in other articles..not that I am really worried because I love my S3 and only had it since September...Premium Suite was supposed to be in 4.1.2 build..it is everywhere else except the U.S. which is ridiculous..
I read that as well.I read a while back when the S4 was being announced in NYC that a Samsung rep said that the "S3 will get any software enhancements that the S4 has, except the ones that are limited by hardware restrictions."
I read that as well.