So what's the story?
Westcott and Hort's Introduction to the Original Greek New Testament [1881] was taken off Prepublication.
Same thing happened with the Samaritan Pentateuch more than a year ago.
Why was it removed?
When will it be offered again?
There was an answer from Logos why the Samaritan Pentateuch was removed quite a while back, but I cannot remember the details. However, I do remember that they still were hoping to bring it back. Maybe someone will have more details.