I'm so happy to see you guys getting involved with suggestions for this problem. I think this is a really nice way to tie together information, whilst not feeling jarringly separate from the game.
There's some things to tackle first before we get to region based extra information - i.e. right now, a serious proportion of players logout directly after the tutorial. That's a really important problem to try solve :).
This idea itself could have minimap symbols that players are introduced to so they know what to look out for - it is essentially making a good version of the Lumbridge guide - who right now isn't all that useful.
Keep the ideas coming!