An absolutely great episode. There weren't a whole lot of big surprises, other than Arya, I guess she took some faces with her when she left. One thing, I actually burst out laughing when Tommen killed himself because it reminded me too much of this:
That said...
Game of Thrones Just Trimmed Its Talent Salary, Big Time
We might not have been sad to see any of them go, outside of Margaery and Tommen, but Game of Thrones just killed off so many people that their budget for actor and actress salaries must have dropped at least 40%. Many of the "dead" are well-respected (and probably well-paid because of it). That said, whatever was just cut in salary is probably about to get eaten in VFX budget.
Littlefinger Will Be a Problem
Littlefinger laid out his unsurprisingly ambitious goals to Sansa, who just straight up rejected him. Even worse for Littlefinger's plans, it looks like Jon has all of the lords he brought along all in on defending the north from rampaging hordes of undead. Almost certainly a big part of next season will be the confrontation between Sansa and Littlefinger...who will win? Or will both perish?
Sending People Away
Danaerys distanced herself from Daario Naharis, telling his Second Sons to hold Mereen for her, meanwhile Jon sent Melisandre away. I don't think we'll see Daario again in the series, aside perhaps from a brief cameo, but I do expect Melisandre to have a part to play, perhaps she alerts Danaerys to the trouble at the Wall?
Burn Them All
I'm pretty Jaime is going to wind up killing Cersei just like he killed the Mad King, probably when Danaerys' fleet arrives.
Way to Tease Us Game of Thrones
So Bran knows that Jon is, at the least, Lyanna's kid...but we didn't get definite proof that he's Targaryen. Nonetheless, I wouldn't bet against it, but well played on the tease Game of Thrones...well played.
The Invasion Will Not Be Televised (Until Next Season)
So, with the Tyrells and Martells on board and a massive fleet backed by dragons, it sure as hell looks like the stage is set for an invasion of Westeros next season. Perhaps there will be a sea battle along the way against Euron, but I expect to see King's Landing to become Queen's Landing pretty soon.