Murderfang is coming, a new Space Wolf Unique Dreadnaught Unique who's rules are in this coming weekend's White Dwarf. Here is a quick peak at those rules, which are dedicated to slaughtering those in close combat that get too close.
Please always treat early information like this as a rumor.
via an anonymous source
Furious Charge, It Will not Die, Rage, Rampage, and Murderlust (ignores effects of crew shaken and stunned)
Also comes with Murderclaws one with storm bolter and one with a flamer. Murderclaws are S7 AP2, Master crafted, shred, specialists weapon
Also here is a leaked image that can be seen here on Dakka (its not really much to see, but is at least something.