UI Elements
With the release of Odin Inspector 2.1, we will now be working actively on a UIElement integration for Odin. Odin’s property and drawer system is already a good fit for UI Elements on a technical level, as the principles are very similar. As time moves on we'll likely be utilizing UIElements for many things. However, a lot of Odin's drawers will continute to use IMGUI for the time being, and the transition will likely be very gradual in nature.

Unity for small things
We don’t really know much at this point, but as soon as we get our hands on a version, we’ll be on it to ensure that Odin works here as well. It will likely be very similar to their ECS inspector system, so Odin should also be very easy to integrate here once Unity for small things becomes public and the API settles down.

Nested Prefabs
All attributes and editor utilities will always work in nested prefabs, basic nested prefab compatibility is in release but is deprecated, and you can always use the Odin Serializer to manually serialize individual fields. However, Odin serialized data in Odin's SerializedMonoBehaviour does not support nesting of Odin-serialized prefab modifications beyond one layer of nesting and is currently a deprecated feature, and a warning is currently shown over disabled GUI for nested Odin-serialized prefab values - IE, at any time where several layers of Odin-serialized modifications might be applied. This is not an easy problem to solve, and it is possible that there is no feasible solution. We would like to bring full nested prefab support to Odin, but we consider this a long-term project with uncertain timelines that may never pan out.

New Paid Addons
We are currently working on several different new paid addons, at least one of which we hope to be able to release with patch 3.1 of Odin Inspector. As they release, these paid addons will be made freely accessible to all customers with Enterprise licenses, but will have to be purchased individually by Personal license customers.

Generated AOT serialization formatters
Odin currently relies on reflection to serialize and deserialize data on AOT platforms, thereby losing the speed boost gained by emitting custom formatter code on demand on non-AOT platforms where a JIT is available. This feature would allow AOT platforms to gain a similar boost by automatically pre-generating custom formatters into the AOT support dll at project build time. Given Unity's continuing focus on IL2CPP and AOT compilation, Odin has since its release moved steadily towards rock-solid AOT platform serialization support, and this is the final step on that journey.

Much of the work has been done already, and the code hooks for this already exist in the AOT support generation pipeline. The bulk of the remaining work lies in generating custom formatter IL in a manner sufficiently similar to the C# compiler that IL2CPP will be able to parse it into C++ code.

Type Designer - Drag and drop, code-free editor customization
This feature will not only let you to have zero code-dependencies to Odin Inspector, but it will also enable non-programmers to fully customize the editor experience and make it even easier to add support for third-party tools. It’ll also give you a far better overview of what’s possible in Odin. For instance, if you select a float field and click “add attribute”, then the Range Attribute will be included in the dropdown list, but the TextArea attribute wont, since that doesn’t work with floats.

There’s no ETA on this feature yet, but it has a high priority for us, as we see this as the next big thing for Odin Inspector, and we expect it to be the main way customizing your editors in the future. We’ll of course make sure that you have full control over how and where the editor data is saved.

Odin redistributables
For Odin to be usable in other assets released on the Asset Store, for both for ourselves and others, there are - apart from finding a good and fair financial model - a couple of technical problems to solve. We’ll need to make a tool that can take a build of the existing version of Odin, and from it generate a redistributable build that only works for a given asset. It will also do things like rename all namespaces to your decided namespace to avoid naming conflicts with other installed Odin versions.

Attributes for providing editors in the Unity Scene View
Using attributes to customize the scene view or hook into OnSceneGUI is an oft-requested feature, and one that we're looking into with great interest, as there are many extremely exciting possibilities here.