Some fans of the franchise worried about its future when RollerCoaster Tycoon 4 was released last spring as a free-to-play mobile game. That was the first numbered release since 2004, and there was some blowback from players over the move to mobile and free-to-play. Atari reassured fans last year that RCT 4 wasn't representative of the series' future, and announced a "full premium PC experience" without microtransactions was coming in the form of World.
A price for World has not yet been announced, but a new Steam page lists its release date as "mid 2015." You can check out a handful of World screenshots in the gallery below.