The first rule in the weapons section that is different is a new bombing run rule. This is for Flyers and Flying Monstrous Creatures, and is a once use only attack, it is done in the movement phase and you can only drop one bomb per turn. Dropping a bomb counts as shooting one weapon and you may not move flat out. You can shoot any other guns at a different target as before. Bombs use small blasts, except for a Pulse bomb which uses a large blast.
There is now a listing for Primary weapons for super heavies
Next up, the assault phase...