Not related to core D, but we have an LLVM backend and it is
generally interesting for compiler devs.
In the LLVM conferences the Slides/Videos are often interesting.
This year an interesting talk for the D language is the
"Annotations for Safe Parallelism in Clang" by Alexandros Tzannes:
Hi and low resolution video (no slides yet):
Having a simple way to plug a type system to D code will become
increasingly important. @annotations don't suffice.