Friends of the High Line put up its “initial design concepts” for the final, northern-most leg of the world’s skinniest park. Responses seem outlandishly exuberant. The way they’re handling the coming Rail Yard developments — the High Line wraps around the yards, at 11th Avenue — is best described as “minimally.” The High Line’s “interim walkway” will be just a thin path, while everything settles down around the neighborhood. That’s smart, and probably needful, but it’ll be a hot, crowded mess. Anyway: pretty renderings! As always.