A short announcement should give hope to fans as a new PC iteration of RollerCoaster Tycoon is in development and is slated to be released later this year.
RollerCoaster Tycoon PC Game is Coming this Year: We have a new premium PC game in production, for release in Winter 2014. A website and forums will launch soon, where you will be able to directly engage with the RCT Team for this game. Stay tuned for more details.

There you go, a Winter 2014 release and not much else provided in the announcement. I guess we'll just have to "stay tuned for more details."