its all over the place
its the most recent interview with todd howard
somebody already quoted it on this page
"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."
maybe im interpreting it wrong, but it sounds like its still the same tech- evolving though
what i cant give you is a quote from todd howard that says "screw the old engine we built a whole new one baby!"
(edit) which is what i would say if my company made a new game engine
You omitted the parts of the quote that explain everything to you:
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
He says the technology is theirs, and inspired by what they already had. GameBryo (The Oblivion/Fallout engine) is NOT Bethesda's technology, and thus he is not talking about GameBryo... and instead he is refering to something Bethesda has developed internal, which obviously would have to be a new engine.
The part you quoted I'm pretty sure is actually not talking about the game engine at all, but rather about system HARDWARE. I think hes refering to the fact that when developing Oblivion they didn't have the final current-gen system development kits (probably for the 360) until near the end of development so they were not able to use the full potential of the current generation of consoles. With Fallout 3 however, they were able to do a lot more... and now they are pushing even beyond that. That's my take on that, and I see absolutely no talk about the game engine in the part of the quote you posted.
Anyway, its a moot point because I CAN give you a link to a quote from someone at Bethesda that does in fact state they are using a new engine. http://twitter.com/nickbreckon/status/14015054991069184. Thats Nick Breckon, the Bethesda community manager. So its a new engine, period.
Edit: Here is a tweet from the Bethesda Blog twitter page as well... http://twitter.com/Bethblog/status/14010984884604929. Man, its amazing how easy stuff is to find on the internet when you, you know, actually want to find it.