Nerfs to Brigitte and buffs to Ana are indirect buffs to Reinhardt.
Honestly, I don’t think Reinhardt needs much. A bit of consistency on his Earthshatter, maybe a buff to his movespeed while shielding, but he seems pretty solid. The only time I really see a Reinhardt do poorly is when they charge on cooldown and suicide into the enemy team, and I think that’s a player issue, not a hero issue.
His reload key is currently going unused. If they wanted to give him something new, perhaps an ability there that allows him to “overcharge” his barrier for extra resilience or activate the barrier regen for a short time, even while deployed.