Microsoft was the one hiring Guido out of retirement, and alongside Facebook finally kicking off the CPython JIT efforts.
Python is one of the Microsoft blessed languages on their devblogs.
How to stay employed for life: create a programming language which is pretty good, but with some fatal flaws (GIL, typing, slow) and you are set for life.
The project was first suggested by Mark Shannon. Van Rossum inserted himself into the project. Faster CPython people have been fired by Microsoft last year.
Generally not that much has happened in 5 years, sometimes 10-15% improvements are posted that are later offset by bloat.
I think the project started in 3.10, so 3.9 is the last version to compare to. The improvements aren't that great, I don't think any other language would get so much positive feedback for so little.