Challenges for CEA campaign?

Does anyone know if the CEA campaign will have challenges for either credits or just for fun?

I should hope so. I would prefer either 1 weekly challenge that should span 2 missions at least. Or 2 weekly challenges, each 1 mission long, 1 coop, 1 sp every week.

Either that or just let players get Campaign challenges by playing Halo CEA instead of Reach.