I just noticed that Amazon now has The Official Guide to the TOEFL (Seventh edition) available for pre-order! The product listing indicates that it will ship on January 5, 2024. It also indicates that the book has been updated to match the new version of the test. Moreover, there are listings for Official TOEFL Tests Volume 1 and Volume 2. Both have shipping dates of March 22, 2024.
Meanwhile, Princeton Review has a new TOEFL book with a shipping date of February 6, 2024. Barron’s has a new TOEFL book coming April 2, 2024. Barron’s also has an updated version of their venerable TOEFL vocabulary book with an on-sale date of November 7 of 2023, but curiously only a Kindle version is listed (no paperback).