edge+, we figured it's high we time we answered this particular question.
As it turns out, like the Galaxy S6, both of Samsung's new super-phablets sport a Sony-made Exmor RS IMX240 sensor at the back — a 1/2.6" unit with 1.2μm pixels and 16 megapixels of resolving power. Up front, we're again looking at a Samsung-made unit already in use with the Galaxy S6 — the ISOCELL SLSI_S5K4E6_FIMC_IS — with 5 megapixels.
It'll be interesting to see if Samsung will once again push one of its own 16-megapixel ISOCELL sensors for inclusion with the Note5. Last time around, with the Galaxy S6, that particular unit seemed to only become available with latter batches of the device, and people generally felt that it is inferior to Sony's (though we haven't personally checked). In any case, if you hurry up and snatch a Note5 or Galaxy S6 edge+ unit soon, it's likely that the IMX240 is what you'll get.