VLC for Android recently dropped it's BETA phrase and is a full fledged app and as far back as June we heard that they were going to be looking into being able to Cast.
Nice. So what this will mean, I'm guessing, is that it will have to find a way to send video from either the device (or the desktop app... who knows which will get it first) to the cloud for the Chromecast to stream it (or will we be finally be able to cast directly to the Chromecast?)
Anyways, I'm ready to try it out (I've almost given up on my network of sharing folders to my upstairs GoogleTV as it never mirrors files like it should... so I could easily put movies on my phone and then cast them).
Source: http://www.omgchrome.com/vlc-3-0-will-feature-chromecast-support/ via http://www.talkandroid.com/237181-vlc-bringing-chromecast-support-with-next-update/