Pictures have been leaked from the new upcoming White Dwarf Weekly. I think everybody has seen the cover by now.
New Slayer character. This may have been the "giant slayer" I was told about
New Hammerers. These is meant to be in a new dual kit. They are very heavily armoured so could have the alternative build as Iron Breakers, however most sources now point to them and Longbeards making up a single dual kit. My source mentioned Hammerer/Iron Breaker.
My source did get this right. Single Dwarf plastic clampack armed with a hammer. Rumoured to be Belegar of Karak Eight Peaks fame.