Ardeth

Lol if you visit darksun with even a rusty dagger on your hand, a large group of people will jump on you, tear you apart, then tear each other apart and take the dagger(the last remaining person ).

Umm Yggdrasil (the world ash - or the gigantic tree in common) found the in the first layer of Ysgard has access to many planes found with in planescape as well as many other prime worlds. Also Mount Olympos in Arborea has such portals. It won't be hard to write an ''all around the prime worlds'' kind of story. Though they must watch for it might turn into power-play rather than roleplay. I am writing a table-top game with a system I made partially by 3.5 edition and mage:ascension. Anyways WOTC release the planewalker's guide last year on planescape so I don't think they could say they are not supporting it, as that book was on 3.5 edition. I played the game 3-4 years ago as I reckon, and now I am playing again to get the whole insight of the story (ofcourse with 18 wis and int ). I am hoping it does not dissapoint me and disillusion the perfect form it has in my mind. By the way now a days, they can't even release a proper rpg game. I don't think they could get close to writing such a good story as everyone is interested in hack'n'slash these days.