Nobody knows exactly.
It depends on how fast developer would... Develop?
Lobby or Theo (I don't remember who) said that IAP will be released in spring.
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Also this one looks interesting http://www.theotown.com/forum/userpix/571_2_zuege_1_1.jpg I hope it will be possible to add diagonal rails to the Android game, if not then we'll have to do this . I also had this idea, but with roads. While I was making my hometown, I had to put diagonal roads, but ...