-Faceless men
-Warging
-Melisandre's/Thoros's Sorcery
I know it will be tough, with so little to go on but IMO it would really be great to have concrete rules for the supernatural elements we have seen the most. Also, warging ought to be the easiest to do (and IMO I don't think Martin will ever make it more clearer than it is now; heck one of the the chapters of ADwD has varamyr Six Skins as a POV)
Also, the glamours of the faceless men also appear to be pretty easy to make rules for, adding more info as more is released. Dunno about you but playing as a faceless man and or a warg would be cool, especially in such a low magic setting. And there is precedent ofcourse, as GRRM's own 'pc's" are wargs and one is training to be a faceless woman.
