One of the most fascinating inclusions in the Elder Scrolls franchise has always been the vast collection of books we can find and keep, that give us great insights into the lore and history of that particular universe. And yet with Fallout, this feature is almost entirely absent. Yes, there are terminals we can access, and holotapes we can listen to. But most books in the Fallout universe serve only to increase our various stats, after which they disappear forever. Even pre-war books are merely collectible objects with a mediocre bonus. Rather than something we can really invest in. But with Fallout 4, I have a feeling that all of this is about to change.
Following a few interesting discoveries regarding the perk chart, I think I may have stumbled upon something that could explain a very important difference with the books we will be finding in and around the wastelands of the Commonwealth. I do not want to go into my 'perk chart findings' too much at this stage, but suffice it to say, there is a lot more to the chart than is at first apparent.
Back on the subject of books, we know at the very least that skill books exist. We have even heard mention of a returning favorite in 'Grognak: The Barbarian', which was shown during the http://www.gameinformer.com/games/fallout_4/b/playstation4/archive/2015/07/26/fallout-4-quakecon-presentation.aspx?utm_content=buffer11c8a&utm_medium=social&utm_source=twitter.com&utm_campaign=buffer&PostPageIndex=3&PageIndex=3 demo. But the function of books will clearly be very different due to the way that skills now work. Gone is the 1-100 scale from previous games, which would allow an occasional point or two to be added to our total. And so any associated books would also have to work in an entirely new way. Perhaps a clue can be found in a favorite game of Mr Howard himself. The game I am of course referring to is Grand Theft Auto V.
In GTA V, we have a whole range of items that we can collect, usually in groups of 100, that offer some form of bonus. In the case of Fallout 4, I believe that we will be tasked with finding a total of 100 pre-war books (which would actually be magazines), each unique, and each related to a specific skill or stat. But this time we get to keep them, and we can read them. The way this would work ties directly into the time scale used in gameplay. I have given this a great deal of thought, and I am fairly confident that we will be dealing with a ratio of 1:6. This means that 1 in-game hour would last 10 minutes of real time.
Whenever we find one of these books, we would receive a temporary boost in the form of 1 point in the associated stat, or a single rank if it's a skill. This boost would last for 3 in-game hours, or 30 minutes of real time, and would give us access to all of the benefits of the respective increase. This means that we would temporarily be able to craft better items, or open more complex locks, or receive a faster rate of gaining XP, as well as many other options. Where this would get really interesting however, is when this feature is used in conjunction with the Comprehension perk, which requires an Intelligence score of 7. Each rank in comprehension would double the duration of the effect. And so with the 4 available ranks, the temporary increase from books would then last for 6, 12, 18, and 24 hours of game time, which would equate to 1, 2, 3, or 4 hours of real time.
Looking back at the total of 100, this would mean that each skill or stat would actually have a set of 5 completely unique books which, as with the case of Grognak, will also include comics or magazines. In gameplay terms, this would allow us to benefit from this temporary increase a total of 4 times for each. But what about the 5th book?
What I believe is that, as a reward for completing a whole set, once we have found and read all 5 books in any individual collection, the increase becomes permanent. This means that, once we find all 100 books, they will have exactly the same in-game effect as finding the complete set of 20 bobbleheads.
EDIT1: after reviewing the footage again, I am quite certain that the in-game skill books will all come in the form of magazines, with the exception of the 'Grognak' series, which would be comic books. As we find each one, they would be added to the magazine rack seen in the footage, which has a total of 20 slots, one for each set of 5. Also, as suggested by 2-Caps, I believe that each magazine will also come with either a unique schematic, or a unique unlockable item, a bit like the 'free gifts' that are given away with comics and magazines in the real world. Any additional books that may or may not appear in game could then be added to the bookshelf, also seen in the footage. This would include the mysterious book 101 that I have mentioned in this thread. Finally, with the inclusion of an app that we can take with us wherever we go on our mobile devices, I believe that all of these books and magazines will be fully downloadable once unlocked, so that we can build up our own portable Fallout library.
EDIT2: as suggested by LostPony, it would make more sense if there was one unique or craftable item for each set of books. This would give us 20 in total.