Functional Programming in Java, Second Edition: Is the beta program closed now?

I am currently working through “Beta 3” of “Functional Programming in Java” but the website say the book is now in “Beta 4” (although there is no way to obtain that) and the editing team is just working on indexing and typesetting before sending it to the printers.

Should I bother to post errata?

Here is the screenshot. The key information only appears on mouseover.

Screenshot of book page