After reading all these posts... and seeing that next week’s episode will boast more characters than Episode 1....
I agree with the theory that The Night King is gonna pull a Mance Rayder move, when he tells Jon at the 4:30 mark below that he sent 400 men to an unmanned stretch that was 5 miles away.
Translation = I also think the battle at Winterfell is a decoy.
I have a feeling that vision Bran saw of the large Dragon Shadow flying over King’s Landing will be the Night King (riding Viseryon) LAYING WASTE to the Red Keep & the Golden Company, at the same time.
See, I think it’s NOT gonna end up as 2 separate battles. First the battle against the Night King, followed by the battle between Cersei and Dany for the Throne, like everyone expects.
Cersei and Dany BOTH think the ‘war for the Iron Throne’ will be fought against EACH OTHER... after the Night King is dealt with.
But Nah, I think this shit is gonna be ONE big-assed, 3-sided War between the Night King vs. Everybody Else (ie The North AND The South) all at the same time.
Because the ‘real war’ for the Iron Throne is against The Night King himself. And they gonna realize that shit too late.
Think about it... if the Night King got about 100,000 Troops... why send them ALL to Winterfell all at once?
He could topple Winterfell with just 1/2 or 1/3
of them... and send the rest South.
First, I predict the Night King is gonna completely cut-off the North from the South.

and take some of his Troops ‘somewhere else’... just like Robb did to Jamie... then Jamie did to Tyrion by going to HighGarden unexpectedly.
Divide & Conquer.
If so, he gonna catch ALL them fuckers off-guard down in Kings Landing... (Cersei ‘who is not as smart as she thinks she is’... will probably anticipate him attacking ‘at night’.... but he gonna pull-up ‘dumb early’.... during BROAD DAYLIGHT.

)... just like Stannis got caught by Ramsey Bolton before he had a chance to ‘get his strategy & his men all setup’, outside Winterfell.
Cersei gonna find out exactly ‘what happened’ to Dany’s 3rd Dragon... in the WORST WAY possible. All them Scorpion Crossbows that Qyburn built... ain’t gonna do shit. Because they not built to fire ‘flaming arrows’.

And they don’t have no arrows made from Dragonglass.

And all that Wildfire that’s still left underneath the city is gonna explode once that Dragon starts randomly spitting flames everywhere.
If that Dragon could melt The Wall... which was a SOLID MOUNTAIN made of Ice, Rocks & MAGIC SPELLS... then imagine the damage it could do to ‘normal wooden houses’ made with a few bricks... with barrels of Wildfire stored in the basement?
Plus I think that the vision that Dany had (in the House of the Undying) at the end of season 2... was foreshadowing.

Not just a trick by the Warlocks.
Remember we saw her walking though the Iron Throne Room, completely in shambles.. and covered in snow.... I think the Night King does ALL that damage himself... long before Dany even gets down there with her own Dragons.... So her lifelong quest for the Iron Throne will be anti-climactic.... and she won’t want to ‘rule over a graveyard’.
I get the feeling that NK is gonna ‘switch up’ and come for Bran... DEAD LAST..... when he thinks Bran has as little ‘help’ as possible, to protect him.
I also think Dany survives... But I think that Jon dies (again) while trying to kill the Night King.
Either Jon will kill the Night King himself.... or if he dies... then Dany will AVENGE Jon... and take the Night King out somewhere else in Westeros... before he reaches Bran. (When they set a new trap at Dragonstone?

Or in the Iron Islands?

)
“You will never walk again.... but you WILL FLY.” - Tells me that Bran is gonna ride one of the Dragons. Soon. (Most likely during a last-ditch escape from Winterfell, if it gets overrrun by the Army of the Dead & they are forced to bypass all the legions on the ground

)
When all the dust settles.... and the Great War is over... Missande & Grey Worm will leave Dany’s service & go back to Naath.... and I think that Dany will rule Westeros from Dragonstone & end up marrying Jorah Mormont, by the end of the series.
The Iron Throne will be left empty... because it will be too painful for her to sit on it... knowing that Jon sacrifices himself, in order for her to have it.
And in honor of Jon’s memory.... she will let Sansa rule the North... as a completely independent Kingdom... not part of the 7 Kingdoms anymore.
I think everyone in House Lannister dies.

And their name will fade away, just like Sansa told Ramsey.
And I think Euron will get executed by Yara and she will rule the Iron Islands.
By the end of the show...
Dany & Jorah, Sam/Gilly/Little Sam, and some Dothrakis will end up in Dragonstone... Sansa, Bran, Arya & Gendry will end up in Winterfell... Grey Worm & Missande, with Sir Davos plus a handful of Unsullied Soldiers will head to Naath.
They will be the only survivors of the Great War.
After almost a decade of being ‘stuck in the friendzone’... Jorah gonna be the ‘last man’ to give Dany some stiff backshots.
But everyone else is gonna take a ‘dirt nap’ at some point between episodes 3-6.
Just my prediction.