bastion back in overwatch one was the meta charecter, he would turn into artillery form which made him a mounted machine gun dealing mass damage at the cost of movement. he had a self healing abillity that he could use in turret for when damaged, overwatch one used to not be hero or class locked, meaning that you could have 6 bastions on your team, which while pumping out impressive fire power, one flank and its over for all of them, the meta used to be haveing 2 bastions on a payload and would alternate with reinharts shieild and orisas shield with 2 mercys damage boosting them saldy that feture has been removed and now there is role and hero lock.
currently bastion has changed signifficaly sense his overwatch one daybute,he now can move in his altilarary from which is on a cooldown and intead of his self healing that has been moved to his secound perk. his secondary is now an a 36 artillery grenade that stick to eneimes and deals 60 damage
bastion was a robotic fighting machine, he was made to destroy everything in his path he got shut down and damaged when he woke up he forgot all his orignal violent tendencied and became more peacefull with his surrounding he befrendid a bird named gannymead who had built a nest on his shoulder. with this backgorund in mind Blizzerd may make him bacl to how he was in ow 1 or they could go into a compleatly new direction where his focus is aoe damage, or some third option we dont know about