The future
A quote often attributed to the physicist Niels Bohr goes as follows:
Prediction is very difficult, especially about the future.
However, we'll have a go at this anyway, starting with the more straightforward bits. The official ASP.NET Core roadmap lists SignalR support shipping with version 2.1. SignalR is being rewritten, as many lessons were learned with large deployments, and improvements were needed.
There is also the continued progress of the .NET Standard specification, created to enhance portability between .NET Core, the .NET Framework, and Mono. For example, .NET Core 2.0 and .NET Framework 4.6.1 both implement .NET Standard 2.0. This means that projects written in either can use libraries that adhere to the .NET Standard 2.0 spec. As .NET Standard 2.0 is now finalized, any increase in the API surface area will use a higher version number. The .NET Standard is analogous to the HTML5 spec, which is implemented to varying degrees by different browsers. You probably won't...