User blog comment:Hyperborean/"The House of Hades" – official expectations blog/@comment-24339098-20130524013304/@comment-24339098-20130524120924

I honestly don't really believe the rumour myself, it just doesn't seem like Rick Riordan's style to release information that important. Also the rumour came from tumblr so it isn't very reliable, I just thought I should inform you about it.