Thematic mechanical abstraction!
I believe youtuber John 'TB' Bain coined the phrase. What it refers to is taking a set of mechanics and slapping a different theme over the top. For example take the assassins creed mechanics and slap LotR over the top and you get Shadows of Mordor.
If anyone has a great idea to slap different skins over existing game mechanics I'd love to hear it
I like the idea of Jedi Knight themed Arkham City, detective work, fluid combat more in line with the prequals than the originals.
Also DnD themed XCOM for obvious reasons. The Mordheim PC game still isn't good unfortunately.