Being as the amount of xp required to get to 75 takes some considerable time, many many years in some cases possibly a lifetime in others don't rule out other versions, BB will support and develop the game so long as it's profitable. But there not going to jump in there feet first and promise something.
Well last time they said it was a couple months ago or not too far from the day the downloadable version appeared. Steam version was released before that so that's their solution and future it seems. Here is a bit older comment by BB (could not find the more recent one):
http://forum.diesiedleronline.de/thr...=1#post1183690