The last time I got auto-balanced on round end, it had the correct color listed; not sure why it's wrong here. I think CP Assault and PL maps also use a different auto-balance screen (with "You are now attacking!" or "You are now defending!" instead of the team colors, despite those always being BLU and RED respectively).
There are still some other WTFs in TF2. There's one in which your team HUD color doesn't always change when you're auto-balanced, meaning that youor HUD will be the opposite of your new team color. Your portrait is still correct, though. It gets really confusing as a Spy, as when you're disguised, you can see both teams' nameplates.
There are still animation bugs if you switch weapons in the middle of an attack. Or during a taunt.
The annoucer only announces the map type after the first player joins a team. No one else hears it.