One major thing that apparently won't be fixed is the over powered canister shell. in the upgrade description it says canister shell raises the scorpions anti-infantry role, but the canister shell ends up being the 2nd strongest Y button ability(mega-barrage 1st) for the strongest land mainline unit.
Canister destroys, wraiths,locust, and even cobras basically everything. this thing should be toned down against armor it makes using wraiths or anything landbased against scorpions useless, when playing covenant i have to resort to banshees when facing forge, which is impractical for more than 7 or so minutes, cause in the almighty UNSC vehicle depot you can build wolverines that demolish and entire air army with just 5 or 6 of them without spartans in them. heck wolverines can put up a fight against anything in the covenant factory, destroy everything in the summit, and they can kill grunt squads and jackals with ease.
As UNSC i can play a whole match with just a vehicle depot, especially Forge. But with the covenant, if i fail any initial attack, i seem to have to switch unit type and building very fast and seem to be limited to offensive options like the locust while UNSC can change to defense with a few cobras and wolverines. sure the covenant have leaders but UNSC have three super strong spartans that don't count to population. The only option for vehicles are the hunters which by infantry-nature can get destroyed by canister+superMAC/superCARPET/CRYO.
Some people might say that everything is balanced because the covenant have shields(that take a slot in your base) and free teleportation but UNSC all have eco-bonus and super-units but most importantly the ability to counter with powerful units from just the vehicle depot backed up by strong UNSC leader powers. let's not even get started on the crappy turrets for the covenant that are slow and fire in bursts while UNSC turrets fire nonstop and are super accurate.