With a handful of popular Overwatch 2 maps a possibility in the future.
Plenty One Punch Man characters arrive as Overwatch 2 skins in the game today, as the Overwatch 2 One Punch Man crossover comes out swinging. While this crossover is limited to Overwatch 2 skins, weapon charms, name cards, and victory poses, Blizzard is aware that it could be making crossover Overwatch 2 maps as well, but they're an entirely different beast.
"The difficult part with map crossovers is that it does take a lot of work to make an Overwatch map, and we play test them to death, and even then they still have their challenges," Overwatch 2 art director Dio Rogers says in a press interview (via Dexerto).

Rogers then refers to the multiple layers of Overwatch 2 map development, which sets them apart from a crossover like Overwatch 2 One Punch Man, with balancing, competitive, readiness, and visibility all playing a part.
That said, Rogers would love to see something like Naruto's Hidden leaf Village in Overwatch 2, so we can all dream right? This is by no means a confirmation of the next Overwatch 2 crossover, or that we will be getting maps, but it definitely seems like it'll happen.
If you want some help as you jump back in for the Overwatch 2 One Punch Man crossover, we've got your back with a look at the Overwatch 2 tier list of all heroes as well.