Yea. Not using the NIF format anymore since the game isn't using the Gamebryo engine
Gamebryo is more a set of tools and code-snippets than an engine.
Oblivion, Civilisation 4, DAoC, Empire Earth 2, Divinity 2 and RIFT are quite different, yet all were made with Gamebryo.
Yes, Skyrim uses a new engine, as did Oblivion, as did Fallout 3, but the NIF (Netimmerse-File) format predates Gamebrio, and I doubt that the differences will be that large. It was a big step from Morrowind to Oblivion, but Oblivion to Fallout 3 was mainly new structures and different organisation especially for textures.