Is the reason we look for new upgrades, not the hope that it could bring better performance and battery management? Features are of little concerns since most of the new features are often moddable into previous OS versions (soft features such as Jelly Bean feel and look, notification toggles or new animations).
The feature most of us were expecting from Jelly Bean upgrade for GT-i8530 is USB-OTG function, so to plug in a PS3 gamepad and rock games with the phone’s projector. Bad news, USB host is technically not supported by the GT-i8530 (duh!).
Without that USB-OTG function, trading the stability and good battery life of Gingerbread for a buggy Jelly Bean is a failed deal for me. I return to 2.3.6 and tweak it to my liking. What do I like you may ask? Check out the Breezing Beam ROM homepage and leave some comments while you are there