I Don't know, in answer to your first question.
In answer to the second Q. IMHO, yes. But be aware that there are some aesthetic changes from Logic 7 plugins to Logic 8 (and 9).
Mainly they work and function the same, but the Multipressor looks different (though this is covered in Steve H's Mastering Tutorial) & Delay Designer is new.
I know some people don't mind that the plugins look different in the videos compared to in Logic 8/9, while other people do mind!
I'd suggest to check out the previews and see if it works for you.
But, I honestly don't know if a new plugins unplugged is in the works at the moment...