Okay, so from chapter 432 in the manga (of One Piece, for you retards), the cover page had current pictures of the most important Navy members in the series. Like new Tashigi, Ao Kiji, Smoker, D. Saul, Hina. But I'd like to focus your attention to the top two boxes where we see the back of two heads. Now, these must be very important Marines that have not been revealed yet. I'm guessing some are Aka Inu and Kizaru
Unnamed Marines
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The top two boxes are Sengoku and Aokiji. If you're talking about the bottom two boxes, it's Coby and Helmeppo.
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Actually, the two "unknowns" are revealed in that same chapter, IIRC.
! Coby and Helmeppo.
Edit: Aldrich beat me to it. :D
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I've never seen a thread be born and be killed that fast.
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Seriously? Wow. Now I feel really stupid.