According to some changelog: %senderPrefix% now contains a textual representation (., @, %, +, or an empty string) of the user's status in a group chat. (#11882) To test this you can check the iridium theme.
Is that even on the spec wiki page at all?
I couldn't find it in the wiki, but here's another link to the bug: https://trac.adium.im/ticket/11882 Adds the keyword %senderPrefix% which is substituted by the textual representation of the sender's current status in a chat (@ for op, + for voice, % for halfop, . for founder, and an empty string if none). Fixes #11882. Since this seems to be irc specific, and afaik we are not supporting it at the moment, we could just replace it with an empty string. (perhaps add a comment with a link to this bug in case we want to add it later)
I see no reason for this to block 0.6.0. If you want to fix this before 0.6 go for it, but I won't let this block the release, as long as our two main themes work.
Git commit b68526e4b643468c1483ddc6f946638cb7c558a1 by David Edmundson. Committed on 20/05/2013 at 11:26. Pushed by davidedmundson into branch 'master'. Fix %senderPrefix% appearing in themes FIXED-IN: 0.7.0 REVIEW: 110539 M +4 -0 lib/adium-theme-view.cpp http://commits.kde.org/telepathy-text-ui/b68526e4b643468c1483ddc6f946638cb7c558a1