I don't believe there's any news on this at the moment but - for the sake of interest - I've been using fences in visitor areas of parks to create some 'decoration'. It might make the park look a bit industrial if over used - like I do - but if you ever do get a breakout, there's an advantage, as the fences slow the dinosaurs down a bit!
Decorations and better and various terrain tools are the most requested feature wanted by the community right now. We all hope that Frontier is doing something in this way...
Here we got a thread for the nature decoration, leave a comment, your ideas and vote for supporting it https://forums.frontier.co.uk/showthread.php/448422-Nature-Decorations