Talking about the creation engine? Either post official confirmation or get out. Last thing this game needs is more false rumors flying around from baseless posts.
This post stinks of "Hurr durr the graphic style is the same so it must be the same game engine"
Todd has admitted multiple times that "the Creation Engine" is based entirely around the technology used in Gamebryo. So much so that a few months before Skyrims announcement, they stated that they were using a heavily modified version of Gamebryo for their next game. Then they changed their story to state that they modified the engine so much that they are considering it a new engine and gave it a new name. Seriously, just take a look at some Skyrim screens and tell me that the game doesn't have a very "familiar" look to it. I'm not saying that the game doesn't look great, but it is definitely built around the same tech they have been using, albeit heavily modified.
If you want proof, here is quote from Todd directly off the Skyrim website:
"We then rewrote all the major graphics and gameplay systems including lighting, shadows, level of detail, animation, interface, scripting, dialogue, quest systems, melee, magic, and more. All of those changes made it into our internal editor as well. So much had changed that we decided to call the engine and editor by a new name, the Creation Engine and the Creation Kit."
So yes, the game is still based around the tech from Gamebryo, it has just been heavily modified.
"Rewriting" each of those game systems could be as simple as minor tweaks or it may have been rewritten from scratch. Logically, if they literally rewrote every system from scratch, it would have been much easier to just license a new engine or create an entirely new one. They obviously wanted to keep what was familiar and what worked, and tweak it to suit their preferences. I personally think it is more of a marketing tool to avoid the negative stigma of the Gamebryo engine, but that is just me. Truth is, whether you want to admit or not, the game is based on Gamebryo.........hurrr durrr.