It appears that Nork Dedogg will not be a individual separate model release. Instead he can be made out of the parts that come in the new Ogryn/Bullgryn box set that comes out next week. Rules wise, we are looking at a mobile aegis defense line of sorts, and being able to lower their own armour saves down as well giving cover to units behind them. It very much looks like you can get Bullgryns down to a 3+ armour save with a 5+ invul. Give them a power maul, and whoa, we possibly have a very serious new unit.
Please remember that these are rumors, and we do not have an official release date for these units.
via an anonymous source on Faeit 212
Here's some info I gleaned from the upcoming White Dwarf.
Nork Dedogg will come with Bullgryn boxsets, you will have to sacrifice 1-2 models to build him and he acts as a bodyguard for an HQ choice.
There is a 3rd box set being released alongside the Hammer of Cadia and Astra Militarum Defense Forces, Catachan Jungle Fighters set. Set includes 2 squads of Catachans, a command squad, a heavy weapons squad, a chimera and a Russ.
Bullgryns are heavily featured in both the battle report (Orks vs AM) and in their own section. Bullgryns are WS 4 BS 3 STR 5 TO 5 IN 2 A 3 LD 6 Arm 4+, Bone 'ead adds +1 A and LD. They come with Hammer of Wrath, Very Bulky and Stubborn and can take the Taurox or Chimera for transport. Can be taken as a squad of 10.
For the cost of roughly 3 marines they come with Grenade Launchers (12' Range, Assault, Str 4 AP 6 blast) and special shield that gives +1 to cover to any model obscured by them AND +1 to the Bullgryn's armor save if they are adjacent to another model with the same shield.
For the cost of another marine each the Bullgryns can be equipped with Power Mauls and Brute Shields. Brute Shields allow rerolls to Hammer of Wrath wounds and confer a 5++ to the Bullgryn.
The battle report introduces a custom scenario that rewards the Orcs bonus VP based on how far up the battlefield they make it, which seemed pretty orky.
