LewsTherinTelescope

Prologue + first eight chapters are now available on Penguin Random House's website! Click "Look Inside" on the desktop site—NOT "Read an Excerpt", which is only Chapter 1.

As for the audiobook, it's now available for preorder on Audible in the US and the UK.

Note: Arcanum has a good list of all readings Brandon's done, and the 17th Shard has a good list of all samples of any of his works, so check them out if that's what you're after! The scope of this post is slightly different than either of those, as its goal is to be a list of all Brandon's unpublished books specifically without other things distracting from that aim (and admittedly also to give this instance some starter content :P).

Full Books

These are early works (mostly) from before Brandon got published that are available in their entirety.

• The Way of Kings Prime: Full novel with prose download, audio download, and audio streaming options.
• Mistborn Prime: Full novel you can request through Brandon's contact form. Fill it out and his team will email you a copy (can take a couple weeks depending on load).
• The Aether of Night: Full novel you can request from this 17th Shard thread. Leave a comment and the fine folks over there will DM you a copy (can take a couple weeks depending on load).
• Mythwalker (Warbreaker Prime): Unfinished novel posted to Brandon's blog.
• The Traveler: Short story read aloud in its entirety. (The only one on this sub-list written after he was published.)
• Centrifugal: Short story posted to Brandon's blog.

Samples of "Prime-era" Books

These are early works from before Brandon got published that are available in bits and pieces only.

• Dragonsteel Prime:
  • Chapter 1
  • Start of Chapter 14
  • Bridge Four sequence (Chapters 25, 28, 30, 31, 33, 35, & 37)
  • Technically the full novel can be found at Brigham Young University's library, but practically speaking most people can't just pop over there even if they do allow non-students to come in.
• The Liar of Partinel:
  • Chapters 1-6
  • Reading from midway through
  • Chapter 1 rewrite
  • Discarded revision to part of Chapter 2 (Theusa scene)
  • Discarded revision to part of Chapter 6
• The Final Empire Prime:
  • Chapter 1 (Conqueror scene)
  • Chapter 1 (Vin scene)
• The Sixth Incarnation of Pandora:
  • Prologue and Chapter 1

Samples of Upcoming/Potential Books

These are samples written after Brandon got published that have not themselves made it into any book as of yet. Most were simply individual test scenes, although a few have full stories attached that nonetheless haven't been released for a variety of reasons.

† marks works currently planned as part of the Cosmere.

• Sixth of the Dusk sequel†:
  • Opening
• Kingmaker†:
  • Prologue and Chapter 1
• The Silence Divine†:
  • Chapter 1 excerpt
• The Apocalypse Guard:
  • Chapter 1
  • Excerpt (unclear how far into the book)
  • Chapter 1 rewrite
• Adamant:
  • Chapter 1 excerpt
• I Hate Dragons:
  • Original short story
  • Chapters 1, 2, & 4
  • Chapter 5

Full Drafts of Published Works

While Brandon does readings of a chapter or two for a lot of books, there are a few whose full rough drafts have been made available.

• White Sand: Original prose that adapted into the graphic novel. You can get it by signing up for Brandon's newsletter; once you confirm your email it will send you the latest edition, which includes the download link.
• Warbreaker: For this book, Brandon experimented with releasing each draft as he wrote it. You can find a list of all versions on his website.