Here's a good idea of just what you'll get. This is with an E7600 and same R7 250 GPU. Put the viewer on Medium size vs fullscreen if you want to get a better idea on graphics quality, because it appears he didn't give it enough bitrate to view fullscreen, even though he only played at 1366x768 and captured at 720p. He had to use Low textures and mostly Med and Low settings.
[video="http://www.youtube.com/watch?v=VgbInKnInek"]http://www.youtube.com/watch?v=VgbInKnInek[/video]
Certainly doesn't do the game justice, but it's playable. It remains to be seen though how much lag if any he has in the tougher segments, like big battles in the 2nd half of the game in the lusher map.