There are some leaked images showing off the Army Special rules, Artefacts, and the Blood Tithe Table. Its definitely a cool axe that allows you to gain a Bloodthirster when your character dies..... even if it is taking wounds every round. There are just some very cool things that are shown in these leaks.
Here is a link to find them.
https://www.facebook.com/BlogForTheBloodGod
http://imgur.com/84cnhDX,Fod42q3,JFvKWtt,Cu41vO6,gv6n6iQ,8u84u9r,eEiK1xa#0
Also from one of Spikey Bit's anonymous sources here are some rules
http://www.spikeybitsblog.com/2015/03/revealed-khorne-daemonkin-rules-more.html
ARMY RULES
Blood For the Blood God:
Blood Tithe Points are generated each time the following occurs:
– A unit with Blood for the Blood God is completely destroyed, or destroys and enemy unit.
– A character with Blood for the Blood God is killed, or kills an enemy character in a challenge.
Maximum number of points is 8, and are spent for rewards off the table below at the start of the Daemonkin player turn. Blood Tithe Points may be rebuilt up to the maximum during the battle.
Blood Tithe Chart:
1: Infernal Contempt: Friendly units with Blood for the Blood God have Adamantium Will this turn.
2: Insatiable Bloodlust: Friendly units with Blood for the Blood God have Furious Charge, Rage this turn.
3: Unstoppable Ferocity: Friendly units with Blood for the Blood God have Feel No Pain this turn.
4: Apocalyptic Fury: Friendly units with Blood for the Blood God have +1A this turn.
5: Daemontide: 5 Fleshhounds or 8 Bloodletters are summoned within 12″ of any friendly Blood for the Blood God unit.
6: Harbingers of Blood and Brass: 1 Skullcannon or 3 Bloodcrushers are summoned within 12″ of any friendly Blood for the Blood God unit.
7: Dark Apotheosis: Pick a non daemon friendly character with Blood for the Blood God and make a Ld test.
– passed: replace model with DAemon Prince w/ Warpforged armor, retaining all artefacts & Warlord trait (if model was Warlord).
– failed: replace model with spawn
8: Fury Unbound: Pick a non daemon friendly character with Blood for the Blood God and make a Ld test.
– passed: replace model with Bloodthirster of Unfettered Fury, retaining Warlord trait (if model was Warlord).
– failed: model is killed
Khorne Daemon:
Daemon, Furoius Charge, Hatred (daemons of Slaanesh)Chariots have S:7 Hammer of Wrath hits.
Mark of Khorne:
Rage, Counter-attack
Skulls for the Skull Throne:
Must always issue and accept challenges if possible. You may choose the order if multiple models have the option to challenge.
WARLORD TRAITS
1 – Warlord and friendlies within 12″ with the Blood for the Blood God rules reroll failed charges.
2 – Warlord has Zealot
3 – Warlord has +1A
4 – Warlord gains a bonus Blood Tithe point when he kills enemy characters in a challenge.
5 – Warlord has Preferred Enemy
6 – Warlord auto passes Leadership if he uses Fury Unbound, or Dark Apotheosis on the Blood tithe chart.