It will be lost with all your characters every time there's any major update in EA breaking compatibility with the previous version, and most likely a last time when the proper release comes out in a year or so.
...Didn't you post an identical thread less than a hour ago, anyway?
EDIT: Yes, you did.
http://forums.larian.com/ubbthreads.php?ubb=showflat&Number=693685#Post693685
