Ya, the show has laid the ground work for it, as well as the books. It isn't spoiler stuff because it is all just fantheory and conjecture.
1) Show made a point of Mel learning that Thoros, another red priest, learned how to res people. In the book they never met, but the book always implies that Mel knows a lot more red priest magic than Thoros, so we can assume she knows the spell
2) In the book, Mel stays at Castle Black when Stannis marches off. In the show, she tucks tail and runs back there after she realizes she fucked up with Stannis after Shireen is sacrificed. Obviously it is key that she is at the castle.
3) Book and show Mel both seemed pretty interested/enamored with Jon Snow.
If the show ends up starting off with a "Previously on GoT..." and shows that scene with Mel and Thoros, that is pretty much confirmation Jon will be res'd, because why the hell else would they include that scene? I am hoping they are smarter than that and save it for the episode after he probably gets red'd