baz.rb

module ForwardInitialization
  module ClassMethods
    def new(*args,&block)
      # name in this case is very different from self.class.to_s
      const_get("#{name.split("::").last}").new(*args,&block)
    end
  end

  def self.included(klass)
    klass.extend(ClassMethods)
  end
end

module Foo
  class Bar
    def initialize(params={})
      yield
      puts "in Foo::Bar with params: #{params}"
    end
  end
end

module Boo
  module Baz
    include ForwardInitialization

    class Baz < ::Foo::Bar
      def initialize(params={})
        super
        puts "in Baz::Baz with params: #{params}"
      end
    end
  end
end


puts Boo::Baz.new(:foo => "foo",:bar => "bar") { puts 'bazbazbaz' }