How to See Ping in Overwatch – Easy Steps

Presently there are some options that are configurable in the Options menu (such as turning the kill feed on or off), but many of the UI components are not yet customizable. Blizzard is working on some crosshair customization in the near future.

Source: Reddit thread: https://www.reddit.com/r/Overwatch/comments/4ccvgc/crosshair_customization_is_coming_soon which points to a battle.net forum post from about a month ago that is no longer available

Blizzard has also indicated that they would like the spectator experience to match the casual player's UI as much as possible, which will limit the complexity of the customizations that they will be willing to offer.

ETA: There is a hotkey to turn off all UI elements (defaults to Alt-Z). I'm guessing this is for machinima creation purposes and probably not what you are looking for as far as customization.

From an interview with Michael Chu, a Senior Game Designer on Overwatch (emphasis mine):

If you look at a game like World Of Warcraft, the Horde/Alliance split is such a big deal and such a defining aspect of the game. But Overwatch, pretty much from the start, we didn’t want to restrict ourselves that way. Because the game is so much about having the flexibility to play all these heroes and finding all the ways they play well together or against each other. Because of that we decided that the gameplay of the Overwatch universe wouldn’t be bound by that.

Our story justification – what I usually tell people – is that I think of it as, it’s clearly not canonical, but I think of it as how in comic book stories sometimes Iron Man and Captain America fight each other. Maybe in this instance on this map they’re fighting – for some reason they have some ideological difference or something that’s bringing them against each other.

But I think ultimately it was important for the game that you were able to play whatever characters you want. Blizzard has this development philosophy which is ‘Gameplay first’ and this is definitely an example of where we’ve gone with that.