User blog comment:Hermione Chase/"The Blood of Olympus" Expectations/@comment-6064271-20140219032926/@comment-1515612-20140219034720

They definitely aren't prequels to a completely different mythology...

Also, RR has explicitly stated that he had no set time line and/or he just has no intention of telling us. He did the same with Son of Sobek, Singer of Apollo... Pretty sure he has this whole: don't like timeline deal.