User blog comment:Hyperborean/"The House of Hades" – official expectations blog/@comment-50.98.199.110-20130216230616/@comment-5927468-20130217024355

Given the title, I'd bet that Hazel would be on the cover. Maybe Nico as well. Or maybe they'll all be on it. Percy and Annabeth on the bottom (in tartarus), the rest on top.

On a related note, I think the title will be in silver. My thinking is, TLH and MoA had gold letters and Greek POVs. Meanwhile SoN had silver letters and Roman POVs. Since HoH will most likely be Roman as well, it stands to reason it will have silver letters