On a related note, I'm actually really glad they are doing a reveal with substance.
Some of the recent previews have been a bit underwhelming, so I'm really excited that they are revealing the full contents of the box and, judging from "Join us as we unveil the whole box – there may even be a few extra surprises too.", I think it's safe to say that some "Starter set companion" kits (Easy to build, paint set, etc.), as I like to call them, will be revealed, and maybe the Battletomes for the new factions.
But hey, I'm just wishlisting here I'm just glad we are seeing the whole box.