Ok so I mentioned this earlier but I did some digging. This is the image the social team posted a month ago, it has a copy of the image inside itself as a recurring joke, there are two elements that are changed, aside from missing pins and threads on the small version.
The hat in the image that disappeared in the nested one, disappears. That hat was just put on the trading post. Both backgrounds of the trading post images are eastern kingdoms, next to where it says "Forbidden Sea". (The trading post images are a straight cut through the continent).
The hat, kalimdor, the 'old god?' / 'new god?'/ thing could be pushed into something to do with the kalimdor sword hole
This is kinda interesting as a way to embiggen and DOES match with the youtube music video portal that only shows kalimdor over and over.
Niffen / Dig association. Otherwise the hat being over the eastern kingdoms leans more to the eastern kingdom revamp theories.
Something like these two is my favourite leading theories. DIG + Azerite & Void Weapons, it has to be.
Edit: "What came first, the eg or the bert", and the nested boards with Kalimdors, one is smaller than the other? Time loop stuff to make continents larger?