In early seasons, when the show more accurately reflected the books, one of the main themes was "This is a deconstruction of various tropes, including 'the hero always comes through in the end.'" That's why stuff like Ned Stark's beheading was considered such a gut-punch.
However, the show has since done away with that. and started putting "plot armor" on certain characters (not even counting Jon Snow's resurrection): Arya shrugging off a stab to the gut, Gendry (IIRC) running from north of the wall to Dragonstone at supersonic speeds so Daenerys and her dragons could rescue the men on the frozen lake surrounded by the dead, etc.
So if they were still in "Anyone can die, even the heroes" mode, I'd say Winterfell will surely fall and everyone in it dies. But since the show does seem to adhere now to at least SOME traditional "good-guy-wins" tropes, I kinda doubt Daenerys AND Jon Snow AND all remaining Starks including Bran AND everyone else is going to die.
Regarding Grey Worm and Missandei: I'd say one of them will live, but of course they'll first suffer some awful trauma over and above having their true love killed by zombies.
Bran will live, at least for the next episode, again for plot-armor reasons: whatever the hell role the Three-Eyed Raven plays in the story, it won't be wrapped up by the end of that episode.
Daenerys will also live because IIRC wasn't one of her Undying visions of her in the Iron Throne room, only in winter ruins? So she has to live long enough to get to King's Landing.
Where Tyrion, Varys and non-combatants in the crypt are concerned, I think it will be all or nothing: all of them live, or none of them do. Or, at most, one lives, saved in the nick of time.
That said: if I had to gamble my money on ANY of these predictions, I would only bet sums I won't mind losing.