Okay gents (and ladies?)... let's start hearing some of your unsullied predictions for "The Battle of the *******s" and the end of the season.
I may be going out on a really long limb here, but I'm thinking that Jaime is going to decide to move both the Lannisters and the Tullys north to aid Brienne against the Boltons. In fact, I think that he will be their savior just when Jon and his forces are ready to fall. I realize that Sansa probably wrote to Littlefinger to request support from the Vale, but I don't think Littlefinger is going to come through.
I think that Qyburn and Cersei's "little birds" have found some dirt on High Sparrow, probably something like he diddles little boys. That would strike a crushing blow to the head of High Sparrow's snake
This one is more obvious, but I predict Yara and Theon will save the day at Slaver's Bay, though I'm not sure whether we'll see their uncle again this season. He may cause them all grief when Dany finally tries to move her forces west. Either that, or Euron will beat Yara to the punch and the exact opposite of what I just said will happen (though I couldn't imagine Euron having an entire fleet built, sailing and already arriving in Mereen).
Arya will make it Westeros and join the Brothers Without Banners with the Hound.
Varys is off to forge an alliance with Dorne, and I believe Dany's first steps on Westerosi soil will be at the beaches of the Sunspear.
I predict the White Walkers will make it south of the Wall, and that the Wall itself might even finally come down. If not, they'll at least make it TO the Wall.
These theories should spark some interesting conversation! Let's hear what you've got...