I can't find the quote, but I'm pretty certain. Either way, it's not really worth the argument.
Then you probably shouldn't have brought it up to support your claims.
I agree that it seems ridiculous to disagree with such obvious implications from recent statements, but I'm interpreting "all new" with a grain of salt. With Eurogamer earlier claiming that Todd said it's built from previous technology, there's an obvious tension in the details between the article and Gstaff/Nickb's statements. How would you reconcile that despairing difference?
Which article is that, http://www.eurogamer.net/articles/2010-08-16-bethesdas-todd-howard-interview? Because I don't see that much tension between Todd's statements there and the more recent ones. Here's the quote:
The technology is ours and it is inspired by the technology we have. We have a lot of it. But that's our starting point - the Fallout 3 tech. It started with Morrowind, we went to Oblivion, we did a lot between Oblivion and Fallout 3 because now we had final hardware - with Oblivion we had six months on final hardware, so Fallout 3 technically does a lot more than Oblivion. The new stuff is an even bigger jump from that.
There's a great deal of ambiguity in there, but at no point does he actually say that it's built from previous technology. He does say that they used previous technology as a starting point, but that doesn't mean that it isn't a new engine. That just means that they used the experience they had with that prior tech as the basis for the new engine. And really, the rest of it makes the entire passage look like he was trying to provide an answer to the question without leaving hints that they'd be using a new engine for their next game (since that's the sort of announcement they would clearly want to hold back on until after the game itself is officially announced).
EDIT: To expand on the "starting point" bit: there's an indie RPG called The Broken Hourglass in development that uses Baldur's Gate and the Infinity Engine as a starting point. The people creating it had experience modifying those games, so they used that experience to move on to creating, their own similar game. The result is an engine that shares a lot of similarities with the Infinity Engine... but it's not the Infinity Engine. At all. It's an entirely separate engine developed by them to take advantage of the knowledge they'd learned from working with the Infinity Engine.
Very, very easy to interpret what Todd said in that interview as meaning that Bethesda's done exactly that.
I'm honestly not being anywhere near polemic as others are making me out to be. The polemic is coming form the antithetical responses of others (including you). It's almost as if the response is, "ARG, how dare you disagree that this is one iota less than a completely brand new out of the box engine! You die now!"
No. The problem isn't that you're saying it's an iota less than a completely brand new engine. The problem is that you're saying that them going out of their way to unambiguously announce in multiple places that they're using a new, internally-developed engine isn't enough to confirm that they're using a new, internally-developed engine, while at the same time claiming that you're doing it to try and avoid "unrealistic expectations". Claiming that plain, official statements mean the opposite of what they're saying doesn't prevent unrealistic expectations, it creates them - the only unrealistic expectation at this point would be expecting that they're going to continue using Gamebryo.
Except it's not. Not really. Emergent only went down the pan recently, so Bethesda couldn't have rushed out a new engine in the time between then and now. Most likely they were never going to use Gamebryo in the first place.
Except that Emergent's been heading down the pan for quite some time. Gamebryo was never the most popular engine, but as far as I know its use has been on a pretty consistent decline for a very, very long time. Bethesda probably noticed this and decided to jump ship a fairly long while ago.
I don't think they ditched Gamebryo because they thought they were going to go under. Zenimax have been going through some pretty large-scale expansion, and a new engine of their makes perfect business sense. They already have IdTech5 for closed-world games, now they have the Skyrim engine for open worlds.
As I've said already, id Tech 5 is not an engine for "closed-world" games.
EDIT:
Apparently you must believe everything salesmen and politicians tell you.
If you have to resort to implying that Bethesda, the people producing the game and the only ones who know most anything about it at this point, are actually lying about this to support your claims that it's not a new engine, I'm pretty sure this discussion is over.