Are you mad
A6 have several big things to come like
-terrain editor
-shader editor
-new ligth management
-octree level system
And you won't have that all 4 things finished before
Sept 2006 or more like winter if we count new light management
And A7 have not begun ; and when A7 will start it will be a faster 3D core
and you will can count one year (or more) before some A7 public availability
have you mistaken you milk with some beer