Ya doesn't seen to be any other cannon upgrades in any of the new ships. Saw proton rockets but that's not a cannon. IMO heavy laser cannons would be nice except you better hope no one comes into range 1 of you because you won't be firing anything. Might just stay with the reg 2 dice instead and equip expose or something.
This is where Dash himself will be useful. Moving later and being able to barrel roll will always keep him at range 2 of a target. You can cover a lot of ground with a large base barrel roll. The problem being is that he will cost a billion points before adding any other cards. The 2 attack dice is pretty lame
I don't like being "required" to play a 5 point title plus another weapon to make my big ship pack some punch.