I am on route to Valhalla this year, and had to cut in from the travels to bring the latest update for the revised 40k rules that are being released on May 24th.
Please remember that these are rumors, as we have not yet had an official release of this weeks White Dwarf from which this information is rumored to be from.
via an anonymous source on Faeit 212
The FoC chart is still in the new 40k edition and if you follow it you have what is known as a "Battle Forged" army. It awards (unlisted) bonuses for using the FoC.You can also take a unbound army, these allow you to take whatever you want from your collection and toss out the FoC (while still adhering to unit size and heeding the relationships described in the new Allies Matrix.
Another thing is objective cards, so the objectives of the game can change each turn. The deck will be 36 cards.
There is also a physic phase confirmed now. A pool of warp charge dice is created at the start of the psychic phase, equal to 1d6 + mastery lvl of psychers. You can use as many dice as you like, but increase risk of perils of the warp (which is now a table you roll on.) Enemy psychers can draw on warp charge pool to Deny the Witch and nulify powers.
Also Eternal warrior missions still exist but in addition there are 6 new Maelstrom of War Missions.
via another anonymous source on Faeit 212
Additional information that a Battle Forged list can take as many detachments as they wish, and still get bonus's.. The Unbound lists, is very much whatever you want to throw in to do a battle, and you get to choose which you want to play, and your opponent can do the same.
