Thanks, what is Vulkan....programming language?
Vulkan is a graphics and compute API - what SE is currently using is OpenGL, which had its last stable release in 2017.
It should also enable better performance related to graphics, and also supports compute shaders.
We're also using this opportunity where the code is being heavily modified to refactor, add comments, remove redundant code, and bring everything to "industry standard". That's both good for the end-user in terms of resolving issues (which may not even be known!), and also helpful for us since it makes it easier for both current and future members of the team to work on the project.
So, we're moving to a more advanced (and current) graphics API, and also cleaning things up behind the scenes in preparation for future hires, and for adding and fixing a ton of things - many of which have been on the to-do list for a while.
I think that about sums it up!