Forgeworld has a new and upcoming release for a Heresy Era Dreadnought called the Contemptor. It has a more modern feel in a similar style to the old RT era dreads.
"The Contemptor Pattern Dreadnought was once a mainstay of the armoured might of the Astartes Legions of old. Larger and stronger than standard pattern Dreadnoughts, the Contemptor’s systems featured many examples of techno-arcana steeped in the sacred mysteries of the Legio Cybernetica. Some chapters still boast these war relics amongst their ranks, and whenever the Contemptor takes to the field of battle, it is an echo of the power of ancient days."
And for a size comparison:
Full info can be seen here! And yes, I do plan to Chaos the crap out of one!