I'm not sure I would lump Dart in with those as its typing discipline is completely optional. Also Julia, Racket and Clojure are all relatively recent and very actively developed. I think dynamic and schema-less approaches have some very serious legs yet :)

I'm not sure I would describe Racket as recent.

Racket is not a single language as much as a family of languages quite a few which are quite recent.

okay, fair enough.

Hmm. Maybe because we don't need a new high-level language Python or Ruby, but there are opportunities for better low-level languages?

Agreed. The recent spate of compiled languages says more about C++ than anything else.