As for planned in the beginning?
No.
Remember, Shadowrun was published in '89. The idea of a game branching out into different timeframes from LAUNCH was a foreign concept. Who knew if Shadowrun would even be usccessful?
As it took off and did well, THEN you had some people spinning things off with connections to the long longago and, eventually, when enough intrest was built up, starting the Earthdawn branch, but, it's safe to say that it wasn't planned from launch.
(Mind you, while I've *played* since '89, I wasn't part of the design crew, so, not Word of God here or anything.)