Chances are that we will know very soon when the 9 minutes and the real trailer are out.
Are you so sure?
I would say yes.
And if I'm somehow wrong and we don't find out from these, we will know within the next couple of months when the prequel comics & more promos come.
We were having the exact same conversations back in 2008-2009 when we still didn't know who Bana was playing and before those trailers started airing.