Its not very smart to add static typing to Lisp, goes against the strengths of the language. At that point just program in another language, there’s a lot of benefit of static typing that IDEs can take advantage of but for anyone half decent at Lisp, they wouldn’t feel any need for static typing (outside of compiler optimisations, which is a different thing).
Now in terms of interesting things, check out European Lisp Symposium https://european-lisp-symposium.org/
The talks from this year were highly entertaining
The other really cool thing in CL IMO is Allegro Cache - in memory datastore that is a joy to use