You do not have to re-unlock. However, the jury's still out on the grade thing if that's of any concern. I don't really mind that. All your titles, costumes etc should be carried over.
https://fbcdn-sphotos-d-a.akamaihd.net/hphotos-ak-xfp1/v/t1.0-9/10982603_907945355890888_5058926956225057463_n.jpg?oh=2d05bc6be03cbca9b9656199e0b83245&oe=55532751&__gda__=1432148440_c0e7ef7f3638afd591859b649f17d4f5