Insidious was never on the table from my understanding, it would be too much like Dead End.
As much I want to see something new with the icons, I have a strange feeling they will do the same thing with them like they did in 2006 and 2010 (Only thing different was FEAR was the main icon).
I might note FOX has had a lot of say when it comes to AHS, UO (And I think Hollywood) tried a few times but they cant come to terms with FOX. I know AHS was on the table VERY early this yr but it got dropped early as well.
Lastly right now is just brainstorming phase of HHN 25, there not talking to IPs yet nor they know what all they want to do with the event.