They've released a list of POV Characters:
Varamyr Sixskins (prologue POV)
Daenerys Targaryen
Jon Snow
Tyrion Lannister
Davos Seaworth
Bran Stark
Arya Stark
Asha Greyjoy, aka 'The Wayward Bride'
'Reek'
Victarion Greyjoy
Quentyn Martell, aka 'The Merchant's Man'
Areo Hotah
Barristan Selmy
Melisandre of Asshai
Cersei Lannister
Jaime Lannister
An as-yet unidentified new POV
An as-yet unidentified epilogue POV