Headphone Jack

Followed closely by the new d-pad and concave sticks.

By the way...we don't know all there is to the controller either. I remember reading that they are not letting anyone use it just yet...which iirc Shuhei said that would make the HR department very unhappy or something

One theory I saw was that it could be about the improved rumble. Can't remember the exact term but the new dual shock might have some sort of sonic/audio rumble feature similar to SOny Pulse headsets. If anyone here knows about it well please share because I would like to know more as well

Easily the share button, but as OP said it looks and looks like it feels great too - on par with 360 controller.

I like all of them equally.

the fucking triggers

why people don't like that touch pad, it will be great if used properly. UI navigation, gesture typing (we all know how the typing is in current gen). although nobody confirmed, but i liked the idea of binding my controller to my psn account saving trophy info. and logging onto friends PS4 just by connecting my controller and downloading saves via cloud and play.

All of them, as a whole DS4 looks like a pretty good controller. 

The analog stick placement puts PS4 ahead for me though.  I hate offset sticks.