It appears to be just another language. I don't see what's different about it. Anyway, it's not the languages themselves that make them big, it's the ecosystem around it that makes it big.
Well, we don't really know. The keynote claims it is a superset, but elsewhere they say they will strive to be a superset. So how much of a superset are they? Are there huge swaths missing? Really hard to tell at this stage from a tech demo. According to this post they've just been working on this for a short time, so a lot of their statements are defacto aspirational. Programming language lifetimes are measured in decades. They've got a long way to go.
> but this is from the guy that created LLVM, Clang, and Swift… This is the real deal,
Remember Ceylon? The language, which was supposed to be a better Java plus interoperable with Java? That was created by the guy who had created Hibernate and then Seam framework. Where is Ceylon now?
People have different reasons and opinions for starting yet another language. Just because they have created something popular previously doesn't mean this is the next big thing.