It's only really Egyptian feel because of the colour scheme shown and the statutes are gryph chargers not jackals. And pyramids aren't just Egyptian.
A lot of the old warhammer armies drew on our history and stories: Arthurian knights, ancient Egypt, Aztecs etc. The mortal realms don't, they have a favour of their own. It seems GW even want to stay away from the standard fantasy troupe of elves, dwarfs and human, which I think is a good thing.
Give a nod to the old tomb kings but give us something new.