Additional, anecdotal evidence includes the following, which is compressed because it's become incoherent rambling
The Brotherhood without Banners lacks Lady Stoneheart. Instead they evidently still have Beric Dondarrion. This is nice and all, but doesn't really get across their lovely change in tactics - and more importantly, never has Brienne anywhere near her cliffhanger as of ADWD, which should be a pretty major part of her character arc,
especially as it relates to Jaime.
Hardhome was ridiculous. Full stop.
Everything to do with Dorne?? That's another serious case of character derailment, y'all, Ellaria is the one saying 'no war is stupid' and now she's getting super involved to the point she's assassinating her de-facto-brother-in-law? Indira Varma deserves better. Incidentally I only hear this secondhand but -
Euron destroys Dorne?
Why would he even go there, his goals are 'raid the Reach' and 'acquire Dany's hand in marriage or bare minimum a dragon'.
Speaking of Euron - VICTARION?
?? It would make great sense for his Iron Fleet to be how Dany got back to Westeros and all - but if
he has the Iron Fleet, how is Euron getting ahold of it to do the magic bullshit I hear he did in this last episode?
Lovely that Winterfell got wrapped up in a nice neat little bow with the Battle of the Bastards and all, except for several key points including the fact that there were several feet of snow before Stannis the Mannis even got there, and so any battle plans are royally fucked by that. Add to that: Sansa is nowhere nearby, Mance is dead in the show instead of infiltrating the castle (and apparently being caught???), Theon and Asha (or...Yara...) are nowhere near Stannis in the show...
The entire Golden Company bit, Aegon (fake or otherwise) included. (Incidentally I observe that they must have totally squashed him and Jon together, because I could have sworn Lyanna was mouthing 'his name is
Jaeharys' (which would make hella sense because Jaeharys II was Rhaegar's grandfather), and how does it make sense to have Rhaegar name
two of his sons Aegon).
Also various incidentals along the lines of 'the Tyrells can't possibly be all wiped out', 'where are the rest of the Lannisters, I mean there's even Lannisport Lannisters for crying out loud', 'are we just ignoring the Manderlys', 'Lyanna Mormont is great and all but she's got at least 4 other living sisters, one of whom is actively hanging out with Stannis the Mannis', 'whatever happened to Edmure Tully after Arya killed Walder Frey'...[/spoilers]
TL;DR: So yeah like 99% sure he's already written WoW, and might be halfway through ADoS, and has just been suppressing it for that sweet HBO money.