NOTE: This is not a list of features that weren't implemented, this is a list of upcoming features.
Nothing much is known about Quicksilver Slimes. They will live in the Nimble Valley owned by Mochi Miles. They will come with Mochi's Megabucks Update (1.2.0).
Their prototype was added into the game's files in 1.1.0. The Quicksilver Slime resembles a fire slime without the flames, and it moves around faster than other slimes. It also has no largos as of now.
The scrapped Meteor Slimes might still be added in a future update, but this is still uncertain.
Currently none. Though it is reasonable to believe that there will be toys for each of the new slimes.
More Zone Sections/Sub Areas
Current zones will get more sections added to them and there will be more sub-areas for you to explore in the future.
More Treasure Pods
More treasure pods are planned to be added in the future updates.
Currently none that are confirmed; although after the 1.1.0 update, it is reasonable to suspect something similar to the retreat to be added in other upcoming updates.
Adorable Drones will be added, allowing you to automate parts of your ranching experience. Manual ranching will be still required, but drones will reduce your workload and leave you more time to explore. They will be added in The Automatic Update (1.3.0)
This mysterious gadget might be added in a future version since it's referenced in the code. It was originally supposed to be unlocked a week after you got the Hydro Turret. It looks like a ball on a stick and it has to be triggered manually (with a cooldown of 60 seconds after that). Once it's triggered, the Hydro Shower will trigger a rain effect and kill Tarr in its radius, which is about the size of an expanded rad aura.
Iron Rancher Mode
This mode adds a replayable survival-like experience to the game. It has you race against time to collect quotas of various plorts across multi-day rounds. Each round will also include mixed rules and various challenges, including vampiric chickens, random plorts, random tarr spawns, increased hunger and more. This will be added with Viktor's Experimental Update (1.4.0).
The 5-Day Rush is getting an overhaul, including a name change! Rush Mode shares the same goal as the 5DR in that it's a race to get as many newbucks as you can in a limited period of time. However, Rush Mode introduces a variable time limit, that can be extended through smart, efficient play. It will also feature a few bonus offerings out on the range to encourage mixing up ranching with exploring. This will be added with Mochi's Megabucks Update (1.2.0).
Viktor and Mochi will eventually offer you a daily mission as work-for-hire in new zones across the world. These missions will offer unique rewards as you earn favors for each rancher.
Mochi will ask you to herd the Quicksilver Slimes to corner the market with their plorts. (1.2.0)
Viktor will ask you to perform experiments in a virtual environment. (1.4.0)
It hasn't been yet confirmed whether BOb and Thora will receive a new zone.
Similar to the Wiggly Wonderland event, a rotating stock of weekly rewards will be offered to ranchers who know how to hunt down those hidden crates across the range.