Yes you will now have 2 accounts, one on Steem/it and one on the Dtube chain. Yes when you post a video it is put onto the Dtube site as well as your Steemit page. They did not pull a "DLive" move entirely. They have their own tokens but also use Steem as far as voting. They still have a large Steem delegation and they upvote posters to support active users.
That is about it in a nutshell. Hope it helped. BTW I make daily Dtube vids and love it. The site works really well now.