You can read the entire article by following the link to the Warhammer Community
https://www.warhammer-community.com/2017/09/07/codex-focus-death-guard-part-2-special-rules-and-psychic-powers-sep-7gw-homepage-post-2/
The Codex will be available for pre-order this coming weekend at your local store or online the Games Workshop Webstore.
https://www.games-workshop.com/
Special Rules
"While it’s not an army special rule as such, it’s worth noting that nearly every new Death Guard unit has Disgustingly Resilient."
In the Codex:
"The Death Guard will be keeping access to everything they could use in Index: Chaos – so Chaos Lords, Sorcerers, Chaos Cultists, Helbrutes, Possessed, Chaos Spawn, Chaos Land Raiders, Defilers, Chaos Predators and Chaos Rhinos. In addition, there are 9 completely new units in the codex, datasheets for the 4 new units from Dark Imperium"
Psychic Powers
"The new Death Guard codex also brings an expanded Contagion discipline to the army. As well as the powers from Index: Chaos, there are three new powers to complement them."