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Yes, the mechanism is fully implemented at this stage. There's more we plan to do, but what's there now should be highly useful and is not a partial implementation.
The overlay image is NOT for the players to see - ever. It is there for the DM's information only. You can label things specially, have visual indicators that speed up running the game, etc. For the players, there is still just the one image. If you note a secret passage specially on your overlay, it won't appear for the players and cannot be revealed via the overlay. The assumption is that you'd use a map pin to indicate the passage entrance and reveal that, just as you would have done previously. Having complex overlay layers with individual areas revealable to players is a LOT more work, and it's not something we've implemented yet.
The new overlay image definitely supports transparency. However, the overlay image itself MUST have transparent regions in it. If the overlay image is not transparent, then it will simply hide the image beneath.
You can remove and replace images without touching the pins. The pins won't move unless you move them or you replace the image with a smaller one. So just make sure that you replace the image with another that's the exact same size, then the pins will remain exactly where they are and everything will work great.
Hope this helps!
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