He said it'll be something people won't expect meaning:

1. Goes back to him not playing XI and he ends up making Corsair again, because that's something no one would have expected when you mention "Gunner", because how many MMOs have a Gunner that's also an amazing support role?
2. He stated it'll be a Magic user, so not chemist, but will be a "mage".

It'd be easier if he just...told people about it. Hell we were getting info on Blue Mage and Corsair up to a year prior to it's release when they were showcasing ToAU expansion for XI, even if some of the main stuff they showed off we never got for Blue Mage, e.g Spider Web.