A youtube video says it's 09 Dec 2017. Anybody can confirm?

Just try to send a email on their support if that is true or just try to make a reply on their ANN thread.

Further, what do you think about price? ...

ETN have a good volume in cryptopia but ETN needs more exposure to public to get more volume and as result high volume = good price.

Will panicked users dump their tokens upon access?

Maybe dude.

Is it good time to buy ETN or wait until re-launch?

That will depends on you dude , but for me its good to buy some ETN before the re-launch because theirs a possibility that ETN price goes up. Grin

WolfGear