@VegitoReborn has said there are currently no plans to change the post-credits content, according to a reply he got from Marcin Momot, but that this will be passed on to the team regardless (thanks to Vegito for asking and to Marcin for responding, by the way). Adding that content is no small task, and as of yet it's unclear how the expansions will even fit into all this. It's been stated already that Hearts of Stone is playable after the main quest. It's meant for lvl. 30+ players, so it pushes you to start it after the main quest, but to play it in the barren post-credits world... this doesn't make much sense so far. I guess we'll have to wait and see how it's implemented.
I'm not expecting any surprises from patch 1.09. As I said, it would take considerable work to make proper post-credits content, and Hearts of Stone is the focus right now (and will continue to be, as post-launch patches are inevitable).
I'm not expecting any surprises from patch 1.09. As I said, it would take considerable work to make proper post-credits content, and Hearts of Stone is the focus right now (and will continue to be, as post-launch patches are inevitable).