What I thought was interesting is if you paid close attention to that unit design screen you saw:
Tank
Artillery
Troop
As well as a few other things I can't read, I would seriously be interested to see Tanks Artillery AND INFANTRY formations represented in planetary battles
Especially since with my prefered play style with armies I like to sit back and bash you with artillery and then race in with my armored vehicles and or cavalry units flank and exterminate the enemy!