The premiere date for Season 7 is expected to be later than usual, as well, which makes sense.
It’s unclear if Headey’s ex knows about the differences in filming as relates to past seasons, or how much this would affect their custody agreement, but what is clear is that both sides are at a standstill in the matter, and a judge has yet to firmly make a decision.
Part of the issue may be that Game of Thrones actually started filming late this year in order to shoot more scenes that look as if they are in the wintertime, since winter did, in fact, come to Game of Thrones at the end of Season 6.