From the preview:
Hey Everyone - I spent today playing Stretch goal catch up! Here is the Missile system for the Republic Mechs, Free with every miniature of that type for all backers in addition to the basic Tri-Barrelled cannon.
And the next Stretch Goal, another Freebie!
2x Minigun arm for the UC Mechs supplied with each team of three, in addition to 2x smart grenade launcher and 2x EMP cannon.
The weapons will be designed to "push fit" so you can change load out between games.