The top is primary and underneath are attachments. Underneath that is secondary and attachments. On the right hand side it looks like you can have 2 perks per tier. Underneath those are your lethal and non-lethal equipment slots.
My question is.. what is the thing that I have circled here? Could this be character customization? If so, it takes away from the amount of stuff allowed in that class with the 10pt allocation system. I only wonder if it's character customization because when you see the guy using the "MostlyUseMeBlade" class he has all 3 rectangles filled in and his character looks pretty badass (1:20 of the official MP trailer).