Above is a picture of the new Shokk Attack Gun taken from How to paint Citadel Miniatures of the same name. Also visible is a slightly blurred Mega Nob.
The two pictures below are both almost the same but just show a slightly different angle. They appear to be previewing an entirely new 'eavy armour unit sporting kombi weapons. Again the theme of circular saw based weapons feature again.
They appear to be much bigger than boyz so although tankbustas and kommandos spring to mind I don't think that these are those.
Any ideas anyone? EDIT: They may be nobs that have and metal jaws added to them.