Among Thieves and Sworn in Steel - book 1 and 2 in a series that is the closest you will get to Locke Lamora, but in my opinion it is superior.
Shadow Ops trilogy by Myke Cole - good and new urban military fantasy. I founf it wortwhile to read this series, which is complete.
Red Rising by Pierce Brown - fantastic sci fi book. Hunger games for adults with a more exciting story.
Ready Player One by Ernest Cline - If you havent read this book yet, do this one first. One of the funnest and exciting rides which has been published in the last decade.
The Magician series by Lev Grossman - complete trilogy. Excellent writer. Highly recommended.
The Golem and the Jinni - published a few years back - good one.
If you are feeling it, i would recommend these self published guys.
Hugh Howey with Wool Omnibus and Sand Omnibus. They are both a great read.
Blood Song by Anthony Ryan - now published, but he started out selfpublishing. Blood Song is amazing, the sequel less so.
My highest recommendation is Ready Player One and Red Rising. Both a fantastic thrill ride and can be read as stand alones.
On the subject of these kind of "source books". I've seen a few, interactive versions, go through in the course of work and from what I've seen its material provided by the publishers. Much of the visuals are created by designers to a style guide, or just off their own backs. The better designers at least read the books but often are fans anyway so what they turn out can actually be alright. In some cases the author gets final approval. In rare cases the author actually avails themselves of it. The children's author Julia Donaldson really takes the time to say whether she likes stuff, plus her stuff (as a dad) is great, so good for her...
Personally, the fantasy ones I've seen I wouldn't bother with.
Also called a Galley copy or Galley proof. Such copies can become highly sought after by collectors for those books that become very famous, and especially if the original run of 1st printings was also extremely low. Most such ARCs or proofs are very difficult to find in unread condition.
Of course, those ARC are only sent out to very trusted reviewers to help improve the quality of the final product.
Some authors (like Rothfuss or Peter Brett, if I am not mistaken) sometimes post contests on their websites to their most avid readers to send them applications why they should be included in the circle of pre-reviewers.
Thanks for that State of Sanderson newsletter, sf. It's amazing, really. What an incredible talent. I won't complain ever again about waiting for a sequel, no matter which series. He's doing so much it's just hard to believe. Couple that with the quality of the writing, we're very fortunate that he exists.