There are two interesting changes apparent in Alex Kurtzman’s version of the classic Universal monster: the Mummy is a woman, and the character has a much darker-looking design than what we’re used to. The reason for a lot of that, apparently, is because of what Apocalypse looked like in X-Men: Days of Future Past.
Source: io9 – X-Men: Days of Future Completely Changed the Design of The Mummy