User blog comment:Hyperborean/"The House of Hades" – official expectations blog/@comment-108.35.35.98-20121104154601/@comment-69.141.41.80-20121108024639

If you're right about the all-Roman POVs, then Hazel, Jason, Frank and/or Reyna sounds pretty good to me. I wonder how Rick will show us what Percy and Annabeth are doing in Tartarus if neither of them can narrate. And like I said, it'd be nice if we got a look into Nico and his personality some more.

I thought I read a rumor that Calypso would appear in MoA, but obviously she didn't, Echo did. Hopefully she'll appear in HoH. Also, I read a theory in Tumblr that, seeing as Percy and Annabeth are in the Underworld, they may be helped by some of their dead friends - Silena, Beckendorf, Zoe, Bianca, or Luke. That sounds really interesting.