Old thread or not, I'm trying to figure out how to equip my Dread. Autocannons still seem like the solid choice and I don't have any bits for other weapons.
Close combat dreads don't work so well now. It has always been hit-or-miss to get a Dread across a board without him going splat way before, then hidden powerfists became a thing so it's not a good environment for them. It was, however, possible to get something like the best of both worlds before: havok launcher, (back when it put down two sweet, sweet blasts) two combi-bolters, then take a third combi-bolter upgrade. Loads of anti-infantry shooting and it has two power fists.
Current Codex doesn't even allow Dreads to access to the vehicle upgrades list, you can't even make a combi-bolter into a combi-melta, it's stupid.