In my opinion, you can say that Jonas and Gabe make it out of the community and end up Elsewhere. They make it out to a real world where there are feelings and everything. You can say this because Jonas is going down the hill, in the snow (so it can't be in the community) and he sees the lights and he hears the music.
But I think you can also say that he is just making it up in his mind. Maybe he is actually dying. The place where he is going is just like the one in his memory. Why would he have a memory of a place that he is in now? The memory would have to be from long ago so the place couldn't exist in the present. He's just remembering that place as he dies.