Imagine a rule set where both opponents turns happens at the same time! That could be sick! And after both players are finished and pressed the "end" button, there will be a countdown for the enxt turn or something :)
How are they supposed to do all the programming to allow that to happen in a week?
The possibilities are endless. Almost every suggestion in this thread makes me think "yeah that would be awesome". I assume they will start off with something fairly simple and boring just to kick things off. Maybe 'minions only' or 4+ mana cards only.