Seeing as TESO added a lot of new books to the TES Universe, I was wondering if there is already mod in works which would add them into Skyrim, like how Tamriel Compendium added the books from the older games?

Smart idea.

I know TIL team is transcribing them fromhttp://www.imperial-library.info/books/online/by-category, so if you're looking for a consolidated list of ESO books, you could start there.