User blog comment:Hyperborean/"The House of Hades" – official expectations blog/@comment-4515675-20121020161042/@comment-3146930-20121020183256

As far as the Spoiler on his blog, all it says is that we will find out what happened to them. It doesn't say that they will actually have a POV in the series. I mean with all the dream visions and such in the series, it is possible we will only get flashes and such. I mean Hazel's power to show flashbacks appears to not just extend to only her life, but others as well. If she somehow managed to use that to see into the Underworld (like Tartarus), then we could see visions of Percy and Annabeth without them having a POV. Also, whole Percy has had 2 books to narrate, Annabeth has only had 1 so she could still have another book ahead of her.