For unused content, see: Unused Featuresdevelopment roadmap.
NOTE: This is not a list of features that weren't implemented, this is a list of upcoming features.
Wiggly Wonderland 2018
Wiggly Wonderland returns for 2018 and with it comes a festive event to celebrate the end of another year on the Far, Far Range where you will receive a daily visit from the twinkle slime.
Few ranchers have ever even glimpsed a twinkle slime, with most believing it to be a legend, but those that have know it's real. Some believe that if you find a twinkle slime it will leave you with a gift to collect.
Viktor's Experimental Update (1.4.0)
Join Viktor Humphries and test a virtual simulation of the Far, Far Range. Well, a work-in-progress version anyway. You see, his work is hitting a wall because of the numerous bugs in the code as well as an unusual phenomenon: glitches that take the form of... slimes? In any case, help him sort the issue out and you'll be rewarded with some nice upgrades and even a new ranch expansion!
Glitch slimes have been discovered living inside Viktor's Slime-ulations and it's up to you to help him quarantine them before they spread! But like any bug, glitch slimes can be tricky to find: they are often hiding in plain sight, pretending to be objects or other slimes in the virtual Far, Far Range. You'll need a keen eye and a full tank of Viktor's patented debug spray to get the job done!
It wouldn't be a very science-y update without new slime science gadgets, and Viktor's update will include a chicken cloner, deluxe drones, and more!
Other New Things
Viktor's Experimental Update is shaping up to be a pretty big update and there's even more packed into it that we won't reveal until later.
As of version 1.1.0, Boom slime explosions and butt-stomps no longer displace Echoes. However, Monomi Park has mentioned that this bug might be re-implemented in a more formal manner in a future update.
More achievements are set to be released in late 2018. 
- ↑ http://forums.monomipark.com/viewtopic.php?f=10&t=5538 - "Fixed bug where boom slime booms would push echoes out of place. However, having seen the amazing fireworks displays some players created, we’re committed to remaking that awesome discovery in a future update in a more formal capacity."
- ↑ https://twitter.com/monomipark/status/966110908358451200