New is pretty relative, but yeah they've definitely been around for a while. I'd say the array languages (APL/J/K) can be used in far more areas than most people think, but I understand your point and am on the fence myself.
What is wrong with 8th's license? It is basically a Forth, so extremely interactive...mostly just messing with a stack...not sure about metaprogramming. I think a production license costs you $200 as a one time fee and you have to pay no royalties or anything for apps (better than many tools out there). Upgrading to a later version comes at a discount too. Most of the runtime is proprietary/closed-source if that is what you were saying (def understandable if you had a problem with that). Also, being a 1-developer project, progress is rapid, but I'd be worried about what happens if the maintainer wins the lottery.
