Android - Android 4.1, Jelly Bean
but keep in mind some are stock apps feature swhich might be replaced or masked out by Samsung crap
for example i got ICS on my Galaxy S2 which intruduce resizable widgets.... but i can't use it because TouchWiz does not support resizible widgets other then Samsung widgets (system it self supports it but laucher is the one that needs to resize widget), to make thing even more pissing off GS3 TouchWiz on ICS support it
But everything realted to system settings, notfications and and APIs (aspecially APIs) should be in