http://blade.nagaokaut.ac.jp/cgi-bin/scat.rb/ruby/ruby-dev/46348

The new features in 2.0.0

• Refinements
• Keyword arguments
• Enumerator#lazy
• Module#prepend
• Converting convention to Hash: #to_h
• %i: a literal for symbol array
• regexp engine is changed to Onigmo
• DTrace support

主要的新变化有上面这些。。准备好拥抱新变化没?