Not sure if there's anything that can be done about this on the Wowza side, but...
It appears that RTSP redirection is broken in Android 4.0.2 . When using RTPSession.setRedirectCode, setRedirectSessionURL, setRedirectSession, the native video player in Android 4.0.2 doesn't actually redirect. It makes another DESCRIBE request of the initial host with the value of the session url provided in the redirect response from the initial host.
The same holds true when handling the redirect in the onDescribe method of IRTSPActionNotify
Any input would be great, although my hopes are not high on this one.