It seems the Wyrdvane Psykers have a purpose after all when it comes to the new psychic powers of Daemonology and trying to control psychic powers. The latest leaks are revealing a very dangerous and deadly new way to look at psychic powers, as well as ways to try and counter your opponent.
Here is a link to the latest leaks on Daemonology
http://descansodelescriba.blogspot.com/2014/05/ultima-horamas-obre-los-poderes.html?spref=fb
Psychic Phase now sits between the movement and shooting phase of the game.
Denying the Witch: the opposing player may attempt to nullify the effects of a psychic power. Its harder to do this than manifest the power.
There are 7 disciplines two of which are new, Sanctic and Malefic Daemonology. These are very perilous and can quickly cause the death of your psykers.
Interesting comment about the new Wyrdvane Psykers from the Astra Militarum codex. It seems that this unit does indeed have a use....... For summoning daemons or other forbidden powers.
