So yes Rites of Battle comes out very soon which will include rules or dreadnoughts (or so we hope) In the meantime for those of you you who dont want to wait around. We came up with our own rules for a Ironclad Dreadnought that we ran as one a solo game with a rank 5 tactical Ultramarine Deathwatch PC.
Strength value becomes 80 character now posses Unnatural Strength x3
Toughness becomes Unnatural Toughness x3
Has a built in Auger Array/Astartes Targeter/Pict Recorder/Lamp in addtion to all the other features of Astartes Power Armor
Provides AP 25 to all locations
Still have power history: recommended is either None shall escape the Emperor's Wrath or Death is Joy
Character can not run and -30 to Agility and Dodge (but may still parry)
Weapons:
Hurricane Bolter Mounted 100m S/4/10 2d10+5 X 5 2000 2 Full Hurricane,twin linked, Devastating(1)
Chain Fist Mounted 3D10t E 10 Power Field Tearing
it also has a heavy flamer as well in as a grenade launchers and a pair of hunter killer missiles which we treated as Plasma Missiles
New weapon quality: Hurricane; a weapon with the hurricane quality unleashes shots in devastating hails often though the use of a tri-barreled design. when firing the weapon in burst or full automatic mode each degree of success yields 3 additional hits ( to a maximum of three times the weapons full rate of fire)
Gm note: This thing was a horde killing nightmare, The marine had both the Storm of Iron and Cleanse and Purify Talents