I wonder if there's room for a language that is small, allows for nearly limitless abstraction, and still has great tooling. Go is (or, you could argue, was) small, and now has better tooling, but is just beginning to increase its ability to create abstractions. Common Lisp is large (only 200 pages fewer in its spec than C++, if I remember correctly), has unparalleled tooling (like the don't-unwind-the-stack debugging and SLIME), and really good abstraction power. Scheme is small and consistent (unlike CL), and also can create similarly advanced abstractions, but is missing some of the tooling that CL has enjoyed for eons.

I'll be really cool to see a language that feels consistent, tight, well-engineered, and small; can create powerful abstractions similar to what can be achieved using CL macros and CLOS; and has an awesome debugger, editor interop, interactive programming with a REPL, build tools, etc.