These "rumors" haven't hurt them in any way (at least that I can imagine) so there's really no need for them to comment on them as this is basically just free publicity for them. Now if there was a severe backlash to these rumors, similar to the one generated by the Todd misquote, which would be hurtful to them, then I can see them publically commenting on the rumors, like they previously did.
Fully agreed. This is what I was trying to say. That is an example of a rumour getting crazy wide, and being potentially detrimental to the reputation and health of the company.
"OMG TESV Confirmed!" rumours happen every three weeks, mean nothing, and merit no reply from the company. Everybody basically knows that they're working on a game and it is almost certainly TESV, so its not a surprise that people speculate, create and disseminate rumours, and such rumours are never going to hurt the company if they don't address them.
Saying '"The fact they don't quash the rumours is proof the rumours are true" is really barking up the wrong tree. A policy of not commenting on rumours to confirm or deny is a basic practice in the industry, in part to keep people from reading into non-replies.
Even if the story from Eurogamer is 100% fact (pfft) why on earth would gamesas come out and say anything? They're not going to change their press schedule just because of a leak or rumour, and they're not going to come out and tell a blatant lie either (David Jaffe is the only person to do this lately, and he got heat for saying that Twisted Metal was not happening before E3, rather than just refusing comment). If the story is bogus, or incorrect in details, Bethesda isn't going to benefit from saying anything either, because they would have to confirm too much to dispute the details, or again blatantly lie.
If they responded to some rumours some of the time, people would jump to conclusions about rumours they didn't reply to (perhaps because they didn't hear them), which is another reason to never address rumours unless they are likely to hurt the business.
So "No Comment" means "No Comment", and should just be left at that, reading into it is a fruitless effort.
("we're not ready to talk about that right now", OTOH, usually means "well, yeah, but we're going to officially reveal that later")