My understanding is that the next preview will be at Blood & Glory next week.
Last year that preview gave us: a teaser for Gloomspite, Made to Order Beastmen, Wrath & Rapture reveal, Chapter Approved 2018, Vigilus teaser, Delaque for Necromunda, Godsworn Hunt for Nighvault and the Blackstone Fortress reveal.
So hopefully be a nice bunch of reveals next Friday evening.