Biggest battle yet CONFIRMED for season 7 (SPOILERS!)
It will be a month-long shoot in Spain, with as many extras as the BotB.
CONFIRMED to be Daenerys vs. Lannisters. Location: the Reach or Dorne.
And it will happen in the mid-season, possibly episode 4, as the leaks claim.
http://watchersonthewall.com/southern-spain-pre-filming-report/
*****
Confess.