What nobody seems to have commented on so far, is that there also appears to be two new additional packs mounted at the rear, outward of the tailfins. I'm guessing these are additional boosters.
So as far as armament goes, the YF-29 seems to have: -
1 x gunpod likley similar in performance to the VF-27's gunpod.
2 x micro-missile launchers on each lower leg.
2 x micro-missile launchers on each mid-wing engine nacelle.
2 x 25mm cannon or laser in wing roots.
2 x head lasers.
2 x Dorsal mounted beam guns, mounted inward of tail fins, likely hinged so they can swing up and be fired over the shoulder in battroid mode.
2 x new mystery wing-pods, likely either missile pods and/or fuel tanks.
Graham