No, 4.1.1 is the latest official. 4.2 is being delayed because of TouchWiz according to SamMobile.
Depends on the device. Most Samsung Galaxy SII handsets received the same Jelly Bean update but instead of 4.1.1 it's 4.1.2
Not sure if it makes a big difference anyways. :-\
Ooops, assumed he was talking about the S3 and Note 2.