There's a bit in the PID that toggles between ordinary and hidden abilities so in theory GF could remove hidden abilities in Gen VI. Don't think they will though.
I'm sort of hoping they'll not bother adding an additional hidden ability to each Pokémon this gen - especially since that could change existing Pokémon's hidden abilities (like between Gen III and IV).
^I would love to have those as Pokemon. :D Will there be a three-headed fire-type Snake Pokemon?
I don't see how they could get rid of them without making gen 5 incompatiable and that probably won't happen.
Well, I'm not overly worried about that so much as them just forgetting DW abilities exist and giving us no way to legitimately acquire them. (Besides maybe importing from B/W somehow) --- "The best things in life must be taken... by force!" ~Captain Khan