There's two shortened seasons left if the rumors are correct. Next season will be 7 or 8 episodes. Last season will be 6 or 7. The writers have pretty much admitted to this.
So, you'd imagine that next season will end any of the political intrigue left (which isn't much) and determine who's on who's side once and for all. More deaths and big battles and yes, white walkers making it past the wall.
Shortest season, season 8, the last season will be surviving the onslaught of the white walkers. Them Vs Dany, her hoard, her advisers, dragons and whatever's left of the armies of the 7 kingdoms which will most likely be commanded by Jon Snow and Jamie Lannister.