Guys if it didn't update it would not change. Don't need to think so hard about this its pretty obvious.
Revision 1A had no effect on this in our fleet.
Don't understand why you are so hung up on this but if you believe your fleet does not update I would suggest you set a cruise altitude in PROG and re activate after any significant holds or delays you encounter. Your doing it for nothing and will appear foolish because it won't change the data more than 1 kt but it might make you feel better.
Good Luck guys