Frank O Conner deconfirmed Master Chief and everyone accepts it and nods their heads. "Bummer, but whatever"
Shinji Hashimoto deconfirmed Sora and suddenly everyone is an expert on NDAs.
You can really tell who the fans rooted for harder
Devil's in the details.
I'd much rather use the Halo twitter's response post as evidence pointing to Master Chief's decon - because of Frank's, well, style of posting on the net. Not just tweeting. With him, I'm of the opinion that he's decon'ed for this Pass unless (and a big unless) it's all an intentional misleading couple of posts. For the record, I'm counting that as unlikely as possible (1 part per million, we're talking that scale).
With Dante, the wording was "a new Nintendo release" so I would actually not count him out if Capcom's got something in store this E3 (like a Nintendo port). Not counting on that happening either, but not impossible to consider.
I'd be likewise cautious on Sora's possible decon. There's a point in that NDA's are very tricky business, and unless a twitter post is backed up it could be meaningless. It's been pretty much why Chinderblock really didn't consider Frank's tweet a decon, but the Halo Twitter's tweet a much, much stronger reason. The Halo Twitter post very strongly pointed to no NDA existing.
Not heard about the other decons to really say.