I looked at REBOL years ago, thought it looked kind of okay, then ran into the whole issue that they wanted to be paid for it. I don't believe that anyone should be required to give their work away... but when I can get Python, Ruby, or Perl for free, why would I want REBOL?

Also, I think their announcement is a bit rude to the Open Source world. Sounds like they are reluctant to do it for fear that the unwashed masses (us) will come in and, I don't know, name a variable improperly or something.