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how did you get the grey, castle-y looking one in the middle?
Are you kidding me? The whole point of this post by the devs is to tell you that THEY don't know. They're ironing out bugs and fixing the whole 3d rendering thing so that you don't crash the game on day 34, or have a corrupt save of your mega house that you built in the woods.
The developers want you to die in the game. There is no survival, only for as long as possible. By escaping you win, defeating the purpose of the game. However your idea of and X day was what I was thinking about. Perhaps the Helo landed with supplies, only to be swarmed by Zed? Or a crackpot team of self dubbed "Zombie Killin' Squad" shows up that wants to kill both Zed and you? Or the army sends in people to help any survivors? The Radio would be a good idea. Perhaps you can use it as a means of entertainment by talking to others, or trying to find others to help carve out a safehaven/superfort? Just throwing out ideas now hahaha.