MiniWargaming apparently has seen a new Abaddon model which should be coming sometime very soon. You can see on the link below exactly where it is said. This looks like it could easily tie into a small miniature release in the coming weeks.
It is possible he was talking about the rules in the new codex. Hard to say.
via MiniWargaming
https://youtu.be/HT-6h3fiS2Y?t=1011
Full video here