XF 2.0 Custom user fields if upgrading


Well-known member
Hi all,
Just wondering so we can plan ahead for upgrading;
Our site relies heavily on custom user fields. They're an absolute must for the site and the same will be required for moving to XF 2.0, my concern is this;
If we upgrade, what then happens to those user fields? Will they be imported and the changes would be reflected on the upgraded site?
Or if not would I need to redo them then batch update users?
Thank you..