4S 5.1.1 jb should i upgrade to 6.0 .1 now anticipating the 6.0 JB? or get 6.1 when it's released and JB that. confused if the new JB is only up to 6.0.1 and don't want to be forced to go to 6.1 if it is not included in the upcoming JB. Pls advise. THX