Just to clarify is the Helbrute a variant of Chaos Dreadnought, or is it simply what GW has decided to rename Chaos Dreadnoughts in the 6th edition? Frankly the descriptions of the two are practically identical. I am your master! At your service. Supahbadmarine (talk) 22:24, January 25, 2013 (UTC)
It appears GW has decided to rename Chaos Dreadnoughts as there are no longer any, only Hellbrutes.
Tabletop wise the Helbrute replaces the Chaos Dreadnought, fluff wise the Helbrute is a mutated Chaos Dreadnought and Chaos Dreadnoughts still exist fluff wise.