This morning we get to recieve little bits of Chaos rumors. The first part mentions having trouble with enemy psykers. I am assuming psychic hoods are still going to be available, and that this simply means not much else to nullify psykers. However, only time will tell.
Please remember that these are rumors, and to take with a grain of salt.
A quick tidbit...
Apparently Chaos will still struggle with enemy Psychers, though Khorne will ne able to nullify psychic abilities that target HQs and some unit champs that can take a specific wargear upgrade, most likely Collars of Khorne or something very similar.