I strongly doubt that the debut prefix on the new $100 is BJY. I think that BJY would be available in the Lasting Impressions set. I strongly assume that since there have been no previous $100's printed by CBN, we would probably see debut prefix EJ*'s.
For more information, please go into the "One Hundred Dollar Notes" section, then go into the category "CJA or BLA?" to learn some more about the possible debut prefixes on the new $100 note.
Thanks, Jonathan