Rafe Zetter
Banned
You kind of answered your own question with the 3 letters "NDA". Unlikely to get any whispers from any of the folk that attended.
Surely an NDA is only active until such time as the content has been delivered - saying they knew about it beforehand AFTER it's been made public is pretty moot - try making that stand up in court.
The OP is asking if the stuff they saw was what has already been delivered or "something else", and if it was "something else" then that's all they have to say.