http://www.eurogamer.net/articles/2017-11-04-wow-classic-blizzard-answers-some-of-the-big-questionsGood information here
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J. Allen Brack: Some of the reason for why we're not ready to talk about that is... we actually don't know yet. The important announcement today was: we're doing this. We've heard the community, we've heard our own internal teams, we've heard all the comments over the years. When it comes to the details, we don't know all of the answers just yet.
There's also the fact that now we've announced this, we might want to partner with the community on some of those answers. WOW changed a lot in the first two years, before The Burning Crusade came along, and so, how exactly should it work? Those are questions we need to talk about, for sure.
I think it will be awsome