What you will be most surprised about after mov
What you will be most surprised about after moving abroad will depend on how open-minded you are, and of course as mentioned above, where you will be moving. But if you are open-minded and flexible, and don't put yourself into an expat bubble, you will be surprised how many of your basic assumptions will be called into question.
For example, many people tell me that they can't travel for a long time because they cannot imagine life without (then they name certain possessions, habits, conveniences, their present friends and family, their native language, etc., etc.) You will be amazed how many of these things are either there when you thought they wouldn't be, or that you can, indeed, do without, or replace by others. True, many expats never let go, so if all you are moving for is to have the same things but maybe cheaper, then you will be missing out on the greatest rewards of moving.
(Jet Metier of Best Places in the World to Retire, talking to a woman from Oaxaca, Mexico, pictured.)