SPOILERS SPOILERS SPOILERS
At the start of season 7 someone on Reddit posted the spoilers listed below. Most of them have kicked in.
So those that haven't kicked in may well happen in the final episode, so read it at your own risk.
1) Uneasy alliance forged between Cersei, Dany and Jon to fight against the White Walkers
2) While Jon refuses to bend the knee to Dany, he agrees to relinquish his King In The North title if she helps him fight the threat in the north
3) Cersei, Tyrion, Jon, Daenerys, Jorah, Varys, Missandei, Qyburn, Euron Greyjoy, The Mountain AND The Hound meeting together at the Dragon Pit in King's landing
4) Jon has brought an undead wight to prove the seven kingdoms need to unite against the Night's King
5) Cersei agrees to help; but when the time comes for her to send her armies north she reneges, hoping the White Walkers and her opponents will thin each other out. This is the moment Jaime gives up on his sister, disgusted, and rides north to join the fight
6) Cersei also believes she is pregnant with Jaime's child
7) Later in the season wakes up in a blood-soaked bed and is thought to have miscarried

To get hold of the wight, Jon had taken a team consisting of Tormund Giantsbane, Beric Dondarrion, The Hound, Thoros of Myr and Jorah north of the wall
9) But they are attacked and surrounded on an island on a frozen lake by the Night's King, where Thoros is killed by a wight polar bear (meaning Beric is down to his last life). Jon Snow's uncle Benjen AKA Coldhands is also killed protecting Jon
10) The group are rescued by Daenerys and her three dragons - but not before Viserion is killed by the Night's King (bonus points for even getting the correct dragon killed)
11) He then resurrects the dragon as his own mount
12) now breathes blue flame - and uses him to destroy The Wall
13) Jon and Daenerys will finally meet
14) And end up in bed together by episode 7
15) Gendry - last seen rowing away from Dragonstone in season three - finally makes a reappearance in King's Landing, where he is forging weapons; Davos jokes about him 'still rowing' when he finds him.
16) Arya's direwolf not seen since she chased her away to save her all the way back in season one - is also reunited with her mistress
17) Arya's first order of business in the season is to summon all the Freys using the face of Walder whom she executed last season, and - after sending all the women out - proposes a toast, poisoning the lot
18) Littlefinger also tries to play Arya off against her sister, using the letter Sansa wrote to Robb under duress of the Lannisters
19) Sansa sees through him - with the help of Bran - and has him executed... with Arya as executioner
20) Another character making a return is Jorah, who is cured of his greyscale by Sam, who had discovered an account of an old maester in Oldtown who had cured himself.
21) Sam and Bran also discover Jon's true heritage, and that his real name is Aegon.
22) Gilly meanwhile stumbles across the information that Rhaegar's marriage was annulled, and that he remarried Lyanna Stark, legitimizing Jon's claim on the throne further.
23) Early on, the Lannister army attacks Dorne and Highgarden, wiping out what remains of houses Martell and Tyrell
24) Lady Olenna admits to Jaime she killed Joffrey, and Jaime allows her to take her own life by drinking poison.
25) On the way back, Dany ambushes part of the Lannister army - defeating them despite their possession of anti-dragon artillery, designed by Qyburn.
26) Tyrion meanwhile begins to worry about Dany's temperament, after she tells Drogon to burn some Westeros lords - including Sam's father Randyll - for refusing to kneel before her.
27) Euron meets and destroys Yara's fleet, taking her prisoner while Theon narrowly escapes. Euron also kills two of the Sand Snakes and captures Ellaria, presumably after forging an alliance with Cersei
28) after being freaked out by the wight, Euron - who asked if they could swim and got a negative reply - returns to Pyke
29) Theon eventually meets with Jon Snow, who only allows him to live because he saved Sansa.