I'll venture a guess here.
ESPN has the TV rights, and wants to generate as much buzz as they can about the WSOP. SO between now and about mid October they will just release enough TV to wet our appetites. Then Mid October or so, they will start the blitz with all games show edited to perfection finishing with the November 9 final table. By then they will hope that the whole world knows who is playing because at this point they are all new names for the most part.