We don't have a list written down, but I can explain what we're working on and what's in scope.

We are currently mostly focused on modules. We're working on how compilers and build systems should talk to each other there.

We're also starting to take a look at how to describe libraries to a build system.

SG15 covers anything related to tooling: compilers, debuggers, build systems, IDEs, static analysis, formatters, etc... with the overall goal of improving the C++ tooling ecosystem by forming consensus on how things should work with tooling vendors.