First! 
Does this fix the Javascript vulnerability? Is Javascript working again on shared projects?
Cool!!
No, it was added for a reason. But this fixed the libraries needing JS.
Yay! I'm so excited!
If we worked on projects in the development versions of 7, will they work into the weekend's release?
(I feel like this is a no-brainer, but I just want to be sure about it.)
6.9.2 will be there? (currently it's 6.0.0)
Sounds really cool 
I´m excited!
Yeah, good catch, we'll update that.
By the way, is it known what dev version will be on https://snap.berkeley.edu/versions/dev/snap.html?
Do you mean what number it'll have? I mean, at first it'll be the same version as the released 7.0, but as we add to it, if there's just a quick bug fix it'll be 7.0.1, and if there's a serious new feature it'll be 7.1. But your question makes it sound as if we have more new code just waiting to jump into dev, and that's not the case.
Ah.
Yay! What a great early christmas present
Early Christmas present, or whatever holiday you celebrate!
confused on project transfer: will our projects be automatically converted to 7?
Your projects will work in 7 unchanged. When you save them, they'll be in v7 format.
If your project uses a standard library with JS code, you should re-import that library to take advantage of not having to click Enable JS each time.
Snap! is still in 6.9.2 whenever I press the "Run Snap!" button on the front page. What can I do to fix this?
From what was said at the conference, there are still a few issues to sort out before it's released
So I think it's best just to carry on coding and wait till it's actually announced that it has been released 