When you reveal a pin, that pin becomes visible to the players, both in Player View and in the upcoming Player Edition where players get to view all the information you've revealed to them.
At present, the Player Window, which is what the players see during the game, is a SNAPSHOT of what you've revealed to them. When you move the mouse over a pin within a content tab, that's completely DISCONNECTED from what's going on in Player View. This is CRITICAL, because nothing updates within Player View until you actually SAVE your changes within a content tab. Otherwise, you could inadvertently reveal areas that you didn't intend and give the players information they shouldn't know.
Having mouse-over response on pins in Player View is something completely different from what's currently in place. More importantly, dynamically changing the display as the GM moves the mouse is a MUCH more complex request if we want to support a remote version of Player View so users who aren't in the room can see what the GM is showing them via Player View. Live updating now becomes necessary instead of the snapshot approach. And this is something lots of users have been asking for as well.
The primary thing that was requested in the Feature Requests forum is the ability to have the text always shown for pins. That would work smoothly for remote Player View as well as the current Player View mechanism, since it would work well in a snapshot model. Quite possibly, we'll do something like that first.
FYI, the current behavior has been in Beta testing with hundreds of users for two years now. Not once have any of them asked for live mouse-over updating in Player View. Based on that and all the glowing feedback we received from users, I would contend that the current behavior is certainly not "useless". I can wholly understand how it could be MORE useful with your proposed enhancement, but all those users definitely found it useful without that capability.
