Another interesting announced project was an X-MEN GRAPHIC NOVEL by Neal Adams, in 1982, that never materialized. It was covered in COMIC BOOK ARTIST # 3 (an issue that focused on Neal Adams' late 60's/early 70's Marvel work).

Neal Adams discussed the proposed X-MEN graphic novel with Jim Shooter in 1982, and did 5 pages on speculation, on the verbal agreement that Shooter would draft a contract where Adams would have part ownership of his work, and not the then-standard work-for-hire Marvel contract.
A month or so later, Shooter didn't come through with the promised new contract, and Adams discontinued work on the project.
With Adams' exit, Brent Anderson was recruited, and the project evolved with Chris Claremont into the X-MEN: GOD LOVES, MAN KILLS graphic novel, released in 1983.
As I recall, there was also a Neal Adams X-MEN PORTFOLIO announced. I can't recall if the portfolio was actually released, or likewise cancelled.
Marvel recently released a Marvel Masterworks hardcover of Adams' X-MEN work that ran in in issues 56-63 and 65, published back in 1969.
Two Marvel Visionaries trade paperbacks of this material were previously released, over the last 8 years.