increased interactivity: Haskell is moving towards a more interactive workflow. We recently got deferred type errors which let you turn type errors into warnings. This means that you can load and interact with code that doesn't typecheck, making the repl much more useful.
The next step after this is the addition of type holes. Type holes let you leave a hole in your program and the compiler tells you what type it expects for the hole. This is very useful if you get confused or are just working on something complicated. The feature was borrowed from Agda and the general idea is to let you develop in a "goal-oriented" way: you can develop step-by-step where, at each step, you know what types you already have and what types you need. Your task now is just to fill in that gap.
In essence, the goal is to turn a more batch-oriented experience into a conversation with the compiler. You can expect some editors to start taking advantage of these features, behaving more like Agda mode.