Kyatric : having dealed with WebRTC support in browser those last weeks for plugin dev, I can say that it's urgent to wait ;). Not everything is working, FF support isn't on par, etc...
birdlantern : I have done some research for you ! You can apparently use a Flash file to speak to an OSC server. I'm finishing a plugin now for a client, and working on Spriter plugin also, so I won't be able to help you with that for the moment, but there's something there : benchun.net/projects/flosc. It's a Java server, bridging with a Flash client to exchange OSC messages. I don't think there's a way to send OSC message directlty from the client, because you need to forge packet that aren't websocket or HTTP, so outside of the Javascript's range (and I don't know if somebody tackled the work to forge packet with Flash's Socket lib...)