You will automaticly get 'SC' -> SLK on the 17th. After that you can send SLK to the Weaver(, wallet or leave it on Bittrex). So It's not possible to send your 'SC' anywhere from Bittrex before the 17th.

It says Darksilk short term: release,
and long term: stabilization.

Does that mean that the stabilization of DarkSilk will not start immediately but instead after a period without confinements resulting in stability and backing?

https://ip.bitcointalk.org/?u=http%3A%2F%2Fi.imgur.com%2FXJMiF2a.png&t=568&c=lgBOkmzk7JdzMQ