telsor
Hall of Famer
I will be completely shocked if the Crypt is not full of undead, slaughtering the living who are sheltering there.
The writers have all the subtlety of a sledgehammer, since they no longer have GRR Martin's material to draw from. They couldn't have been less subtle about it, given the number of times we were told that the women & children were going to be sheltering in the crypt, and that the crypt was safe. Then there's the spoilers in the trailers, with Arya running through the crypt and Jon saying that the dead were "already here".
The chances of the crypt becoming a slaughterhouse are 100%.
There have been a number of comments on other sites to the effect that those 'buried' in the crypt will rise to defend Winterfell. Apparently there are a bunch of hints about 'old magic' and history, etc. related to the Night king's history that suggest this might happen.
I can't say any of it seemed completely convincing, but it's not outside the realms of possibility either.