You must not have taken a very close look because the concurrency story is already great (and will one day turn in to a great parallel story), the built in testing library has a very useful set of assertions and an RSpec like BDD syntax, and safety far exceeds Ruby -- the compiler knows the type of all variables and won't ever let you make an "undefined method foo for Nil class" type of error.
It is a library, not a part of the language. I can have a great testing library in any language. By language I mean actual language, keywords, syntactic constructs. Formal logic descriptions even.
I haven't looked closely enough, the concurrency looks decent but it's not as integrated as in certain other modern langs (e.g. Go, Erlang or certain other FP languages, even certain ones riding on JS)
It is sad to see something this outdated starting up now...
