The time has come. Ruby 2.0 is here!
From the announcement post on ruby-lang.org:
We are pleased to announce the release of Ruby 2.0.0-p0.
Ruby 2.0.0 is the first stable release of the Ruby 2.0 series, with many new features and improvements in response to the increasingly diverse and expanding demands for Ruby.
Enjoy programming with Ruby 2.0.0!
New features include: Keyword arguments, utf-8 default encoding, a new regexp engine (Onigmo) and an asynchronous exception handling API (among others).
If you're concerned about compatibility, the announcement has this to say about migrating from 1.9 to 2.0.
We have also taken care with the 2.0.0 design to make it compatible with 1.9. It will be easier to migrate from 1.9 to 2.0 than it was from 1.8 to 1.9.
If you've played a part in contributioning to Ruby 2.0, we thank you!