The LEGO book library will expand once again in 2024 with the announced publication of a book entitled LEGO Marvel Character Encyclopedia which will allow you to obtain a new and exclusive minifig.
As with all books which aim to be more or less exhaustive encyclopedias of the characters present in minifig format in the ranges covered, this one will list on 176 pages many characters from the Marvel universe with visuals, anecdotes and others facts.
Concerning the exclusive minifig inserted in the cover, the black shape could suggest that it will be yet another version of Iron Man or a character using a helmet based on the same mold, but we know that it You should not trust too much in the provisional cover posted online by the publisher.
The book is already up for pre-order at Amazon, delivery from October 3, 2024:

