According to this posting here, 13.04 will finally disable the support for tray icons by taking away the idea of whitelisting applications for tray icon usage.
My problem is that I have to use several applications that don't care about unity (for example: IBM sametime and Lotus notes; Symantec Antivirus).
Please note that these are all "true" Linux versions of the corresponding products. I can't say if they are supported officially on Ubuntu; but they run fine ... without using Wine for example. So, that Wine tray icons still work doesn't help these applications.
Just wondering: is there any back door that I am not aware of? Like, some generic indicator that could be configured to wrap around the no longer supported tray icons?