As long as we get Sanctic Daemonology with a Holocaust ultimate ability I’m happy. 
More realistically, I do hope at least for some representation of all the disciplines. I wrote about it already in the Weapon Wishlist thread and don’t want to just copy-paste.
There’s really not much limit to what a psyker could do if they want to expand his arsenal to flesh him out but other game systems like Dark Heresy do give them a decent blueprint of what could work.