It looks like team colors are being written to server.log. This is annoying because I have some script automation for dealing with problem players and I'd like to be able to "tag" them a certain color prior to the script taking action. E.g.:
2013-03-18 21:52:00 [INFO] Teleported superMario78 to -452.46,-5013.99,-987.02
2013-03-18 21:52:00 [INFO] Set superMario78's spawn point to (-453, -5014, -988)
2013-03-18 21:52:00 [INFO] <§csuperMario78§r> LOL WHO HAS A BAN HAMMER I CAN GET MYSELF BANNED
2013-03-18 21:52:01 [INFO] <§csuperMario78§r> LOL WHO HAS A BAN HAMMER I CAN GET MYSELF BANNED
2013-03-18 21:52:01 [INFO] <§csuperMario78§r> LOL WHO HAS A BAN HAMMER I CAN GET MYSELF BANNED
2013-03-18 21:52:02 [INFO] <§csuperMario78§r> LOL WHO HAS A BAN HAMMER I CAN GET MYSELF BANNED
2013-03-18 21:52:02 [INFO] Banned player superMario78
2013-03-18 21:52:02 [INFO] [Server] §csuperMario78§r has been auto-banned for spam [spam factor: 27 (detected RoboSpam 7)].
2013-03-18 21:52:02 [INFO] <§csuperMario78§r> LOL WHO HAS A BAN HAMMER I CAN GET MYSELF BANNED
2013-03-18 21:52:02 [INFO] §csuperMario78§r fell out of the world
2013-03-18 21:52:04 [INFO] <§csuperMario78§r> LOL WHO HAS A BAN HAMMER I CAN GET MYSELF BANNED
2013-03-18 21:52:08 [INFO] §csuperMario78§r fell out of the world
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Whispers do not appear to echo the color markup. It'd be nice if the log did this for the user names well.
tell mmgrooves §eMessage of the Day ...§r
tell mmgrooves §e===============================§r
tell mmgrooves §eNow running 1.5.1, which is the§r
tell mmgrooves §e1.5.1 after 13w11a. See:§r
tell mmgrooves §ehttp://mojang.com/§r
2013-03-23 22:22:02 [INFO] You whisper to mmgrooves: Message of the Day ...
2013-03-23 22:22:02 [INFO] You whisper to mmgrooves: ===============================
2013-03-23 22:22:02 [INFO] You whisper to mmgrooves: Now running 1.5.1, which is the
2013-03-23 22:22:02 [INFO] You whisper to mmgrooves: 1.5.1 after 13w11a. See:
2013-03-23 22:22:02 [INFO] You whisper to mmgrooves: http://mojang.com/
Problem still present in 14w11b.

@Anthony Martin:
Can confirm, see screenshot and log:
[08:29:57] [Server thread/INFO]: [Kumasasa: Added new team 'test' successfully]
[08:30:25] [Server thread/INFO]: [Kumasasa: Set option color for team test to dark_green]
[08:30:42] [Server thread/INFO]: [Kumasasa: Added 1 player(s) to team test: Kumasasa]
[08:35:14] [Server thread/INFO]: <º2Kumasasaºr> bla
[08:36:55] [Server thread/INFO]: º2Kumasasaºr fell out of the world
[08:36:55] [Server thread/INFO]: [Kumasasa: Killed º2Kumasasaºr]
(Edit: /say doesn't show colour in log, normal chat & death messages does)
Problem still present in 14w31a:
[13:42:04] [Server thread/INFO]: <§5inertia186§r> hello

Is this still a concern in the current Minecraft version? If so, please update the affected versions in order to best aid Mojang ensuring bugs are still valid in the latest releases/pre-releases. If this has been done, we can reopen the issue.
Keep in mind that the "Resolved"-Status on this ticket just means "Answered", and that we are waiting for further information on whether this issue still exists or not. We will reopen it as soon as the requested information has been deliviered.
Saw this myself in 1.9.1-pre3.

Is this still an issue in the most recent versions (currently that is 1.10.2, or 16w42a) of Minecraft? If so, please update the affected versions and help us keeping this ticket updated from time to time. If you are the owner/reporter of this ticket, you can modify the affected version(s) yourself.
Yes it is.
Forward resolving to the more detailed MC-112693.