Game Grades and IP?

I don't recall ever seeing anything posted about this. Once the Mastery system and the grades come out, will we be seeing the IP you get bound to your grade? So A gets +20% IP, S gets +30% IP, etc?

Personally, I'd prefer it if the two were connected, or alternatively, if exp for those below 30 was bound to grade, though that makes me wonder if seeing consistent Ds will discourage new players...