“Yes Evelyn, "Beyond Betweeen" is in the "Legends 2" anthology, published by Del Rey.
I read it when it came out, and was extremely disappointed. Far from answering the questions everyone has about "between", I found it simply posed more questions, and still left the reader up in the air! I won't go into any detail, as I know a lot of people get extremely annoyed over "spoilers" .You may, of course, have a completely different reaction to it but just don't expect too much when you do read it!
Here's a link to an interview with Anne McCaffrey, in which "Beyond Between" is mentioned.”