To add a bit to Aard's answer:
The "right" way to implement OTR would be through Telepathy, but there is no framework to write it at that level. This is a problem preventing OTR support in a lot of Telepathy-using software, including Empathy and parts of KDE. I hope someone from one of those communities will start pushing an architecture for Telepathy that would allow OTR there.
There is another option: OTR can be implemented at the application level, above Telepathy. In our case, that would mean commhistory-daemon (which is opensource) and the messaging UI. There are some architectural complications, but it would be possible.
It's something I'm very interested in and I'd love for us to have, but I don't expect to have any time to work on it in the near future, unless the magic of opensource can provide parts of the implementation to start from.
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