New Game Mode: Capture the Flag?

I'm not sure if this has been discussed already, but it would be pretty cool to have a Capture-the-Flag mode. There's a flag on either team's base/nexus and the opposing team must retrieve the flag and bring it back to their side without getting killed. If they do get killed, the flag would be dropped and wait for it to be picked up again by someone else. Though I don't really know what complications and logistics this would create, it would be interesting to see different teams explore different strategies to retrieve the flag. Whether it be going in guns blazing with all 5 teammates or tiptoeing through the fog of war using your team as a distraction in mid lane, I can see this being a pretty fun featured game mode.

I'd like to see what other people think about this and possibly give ideas as to how we can make this more logical!