While others are working towards Godot Engine 3.2 which is due later this year and already has some fun sounding features making it in like disabling editor features, pseudo 3D support in the 2D engine, convex decomposition, a new Android plugin system, major update to the Visual Shader editor and loads more work on Godot Engine 4.0 is already underway.
Lead developer Juan Linietsky wrote in a brand new progress report, that they're "almost exclusively" dedicating their time to porting the game engine to Vulkan. Sounds like it has been quite the task too, with work on getting Vulkan initialized taking "considerable effort" but it's now running "nicely".
To help with it, an entirely new RenderingDevice API has been made which should also allow other developers to override Godot's rendering code. Work on the 2D side with Vulkan is about "halfway" ported with 3D to begin around the end of the month.
Their current goal is for the rewritten rendering bits to be up to Godot 3.x levels by October, with "hard work and long hours" being done to achieve it. Hopefully they remember to take breaks, no one deserves to burn-out.