He wrote the foreword to The Joy of Clojure:

"... It’s an astoundingly high-quality language, sure—in fact, I’m beginning to think it’s the best I’ve ever seen..."

Not sure what he thinks now.

Here is what he said then re Arc: "My prediction: someone will get tired of waiting, and they'll Torvalds Arc into obsolescence before it's ever released. (If you don't get the reference, it's what Linux did to GNU Hurd)."

There was a whole "yes language" kerfuffle a while back. Quite frankly, I'm glad Clojure doesn't fit in to Yegge's world view.