As far as the question raised concerns the Telerik UI for ASP.NET Core suite, we do not plan any new controls or framework features that would be available only in Core 3.0.
At the same time we are actively working on the Telerik UI for Blazor suite
, which we plan to make available along the official .Net Core 3.0 release. As server-side Blazor will be available only in Core 3.0, the suite will also be available only for that platform.
If the question concerns new features introduces in .Net Core 3.0 itself, I would suggest you to keep an eye on the Microsoft documentation on that.
This way you will know whether any of the new features will add value to your specific project or not.
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