In a recent interview, Jon Snow (Kit Harington) has warned fans not to get excited for any sort of closure in Season 7 (Interview in link below)

Kit further added:-

"I don’t think you should look too much for closure at this stage in the game, but you definitely do see some meetings that you’ve been waiting for for a very long time. This season moves at an incredible pace, and one that we’re used to from Thrones. A lot happens in a very short space of time, and for that reiason, it’s completely different from other season there’s been."

These lines do make sense, because Season 7 & 8 were scripted in close conjunction with each other and it makes complete sense to close Season 7 as a Cliffhanger of sorts (IMHO).