Afaik there were few additional (lets call it) ‘announced intentions’ since Stalingrad. For sure no promises of course. So what follows is more like time line for info.
First big official announced plan to create PTO happened with the announcement of Battle of Kuban (SEP-2016 but the original announcement is not existent anymore)
And this was additional comment on that subject in MAY-2017:
So, let’s talk about what happens after Kuban for a moment. When we announced battle of Kuban I made it clear that our intention (assuming it is possible) was to do something different, something many have asked for that would shake up the norm - The Pacific Theater starting with the Battle of Midway. It’s been over a decade since a new Pacific themed product was developed and I hope we can change this. After much research and thought we have come to understand that this will be an extreme challenge for us on every front.