How come Dalrymple knows all these things? He's not confirming/denying rumors anonymously, so why wouldn't his sources at Apple stop giving him information if they know he leaks?
Because it's in their interest to do so. Apple cannot come out with an official statement to debunk every ridiculous rumor put forth by "analysts" and reporters' favorite "sources familiar with the matter". Having people like Dalrymple and Gruber casually "leak" information allows Apple to control the media coverage and expectations.
Well, he is not denying that the thing exists... He's just saying that GDC did not provide confirmation
Well, the response "Nope" from Jim usually (actually always) means that that particular claim ain't happening.
"Nope" might mean no to a physical controller, but yes to a software based controller (on iPod touch/iPhone/iPad) in conjunction with Apple TV gaming apps....??
Apple already has a software controller app called "Remote". It'd be fairly easy to add another "controller/gamepad" interface to that, should the new "Apple TV with apps" ever need that.