I can't give out any specific details, but the answer is yes! There aren't too many instances of this but also in some cases, there are important balancing factors which haven't been changed yet in those playtests builds because of new mechanics and interactions with unreleased or reworked heroes.

I think it's important to have a concept of these high damage output heroes, which each have their own limitations and tradeoffs, though not necessarily to fulfill the role of specifically taking out tanks and barriers. This is especially true with the format change to one tank per team in 5v5, because it can give players more options to respond to a variety of challenges they may be trying to overcome in game (more depth of team comps can lead to deeper gameplay). We have taken some tuning steps to make abilities like Storm Arrows and Echo's beam less lethal against tanks but still keep them powerful in other situations.

Its funny, I actually tried to throw him some buffs right before the build went out but I missed the deadline slightly.

He has been pretty tricky to tune with his rework, but it was great to see him playtested by these great players. I feel like his new design is solid, its really just a matter of getting his numbers into a good place now. Since this playtest, we've buffed him in a number of ways: He moves faster in sentry mode, his ult starts dropping faster (though the projectile moves slower so you can see it a bit more), his recon fire rate has been increase, and other buffs.

The tricky thing though, is when playing him it can feel like you still get thrashed pretty hard because he is such a large hero, he is very easy to target and hit with everything (especially when he gets discorded, etc). There is a lot we can tweak with that as well though, such as increasing his passive (Ironclad) to offer more protection while transformed. We also have new tuning knobs ...

So far, broadly speaking, we've found that supports are often more safe in a 5v5 environment because there is one less tank trying to dive and take them out. There are instances where this isn't true, like Sombra and her rework trying to assassinate them, or being sniped easier without a lot of barriers to hide behind, etc. In those situations sometimes its a matter of just trying to position more carefully or maybe Sombra just being bit too OP right now :P

Initially we were worried that supports without mobility to escape might be weak in this environment, but so far we've actually seen Zen/Ana being very strong instead of weak, because of the nature of their offensive capabilities in a 5v5 environment.

This is an interesting one we're keeping an eye on since internally the resounding feedback has been that Zarya is far in the other direction and many think she is too strong and constantly high energy with being able to bubble herself twice.

There's a couple details that get overlooked with this new shared cooldown set-up in that the duration of the barriers have been extended slightly (we started at 3 seconds and its gone down to 2.5) and the cooldown timer starts ticking immediately, unlike on live where the barrier has to be destroyed or time out first. So if the barrier isn't broken your cooldown is coming up quicker than on live by some amount. The current internal cooldown is 9 seconds and it's easy to tune that lower if she isn't performing well, but at some point it breaks down and too many of those barriers quickly gets annoying to try play against.

The flexibility to barrier yourself twice in succession or an ally twice is also powerful utility in itself...

The biggest change here is the less ult gain from tanks. We haven't actually modified and ultimate costs outside of this change (and the implicit 5v5 changes, obviously).

Having ults happen less often was something we were targeting early on, and this tank change largely accomplished this for us by itself. This is something thats super easy to iterate on though, and im sure we'll be tweaking it throughout the game's development/beta etc.

This is something we've been experimenting with, and talking a lot about. No hero has moved roles yet though, but we've started testing Doomfist as a tank (as previously mentioned)

Doomfist's kit is full of crowd control effects and mobility, which makes it difficult to tune and balance him as a DPS in OW2. As a Tank though, he can keep those key properties to his kit since those can fit nicely into a Tank role (mostly the crowd control stuff).

Of course this means he'll be losing some damage and gaining some defenses. This is still being tested and iterated on, so I dont have a ton of details on it yet as it is still in the early stages. Some of the early feedback so far is that he's not really feeling like a tank without having at least one active defensive button (his main defenses are passive atm), so thats something we'll probably try next.