I can already push most media files (including MKV h264) to the XONE through my router using PlayTo and Shark007's codec pack, though obviously this is through live transcoding on the server-side which isn't ideal. The main problem is not being able to seek through most high bitrate files doing this. So on the occasion where things would hitch up and stop playing, I would have to start from the beginning again, or use MediaBrowser which is slightly more adept at transcoding on the fly.
Hopefully this added native support will smooth things over until DLNA crops up though. A sight for sore eyes, for sure.