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Some that are already in the closed alpha for Battlefield 1 have taken to data mining the files to see what sort of information they could gather for the full game. What you find below is everything that seems to have been gathered so far, including the titles of Episodes and Chapters for the single player campaign, the multiplayer game modes, weapons, and more.

I will state right now that if you do not want to see any spoilers, then do not keep reading. Simple stuff, yeah?

Single Player Episodes/Chapters List
• Episode 0 : Prologue
Chapter 1 : ? (don't find more chapters)

• Episode 1 : Friends in High Places
Chapter 1 : Flight School
Chapter 2 : Total War
Chapter 3 : Carry Your Friend
Chapter 4 : Blitz

• Episode 2 : Nothing is Written
Chapter 1 : Hidden in Plain Sight
Chapter 2 : Young Mens Works
Chapter 3 : Hear The Desert

• Episode 3 : Through Mud and Blood
Chapter 1 : Tank Assault
Chapter 2 : Fog of War
Chapter 3 : Out of Gas
Chapter 4 : Steel on Steel

• Episode 4 : Avanti Savoia!
Chapter 1 : ?
Chapter 2 : ?

• Episode 5 : The Runner
Chapter 1 : ?
Chapter 2 : ?
Chapter 3 : ?

• Episode 6 : Epilogue
Chapter 1 : Gallipoli
Chapter 2 : The Runaround
Chapter 3 : Saving a Life

Weapon List
• Standsch
• Beretta Model 1918
• Bergmann Schmeisser MP18
• Browing Auto 5
• Remington Model 10 Trench
• Winchester Model 1897 Trench
• Luger Rifle
• Remington Model 8
• Cei-Rigotti M1895
• Winchester M1907 SL
• Martini Henry
• Springfield M1903
• Lee Enfield MK III SMLE
• Mauser Gewehr 98
• Steyr-Mannlicher M1895
• Winchester M1895
• Browning Automatic Rifle
• Madsen MG
• British Bulldog
• Frommer Stop
• FN Model 1903
• Colt Pocket Hamerless
• Mauser 1914
• Kolibri
• Borchardt C-93
• Mars Automatic Pistol
• Steyr M1912
• Baretta M1915
• Colt 1911
• Lancaster Pistol
• Luger P08
• Mauser C96
• Webley-Fosbery Audo Revolver
• Smith & Wesson Model 3
• Bodeo 1889
• Melee Weapons
• Genades
• Mines
• Anti Tank Gun
• Dynamite
• Mortar
• Tripwire Bombs
• Field Kit Weapons
• Stationary Weapons
• Tanker
• Pilot
• Boat Weapons
• Behemoth Weapons
• Cavalry Weapons

Map List
• Amiens
• Chateau
• Desert
• FaoFortress
• Forest
• Argonne
• ItalianCoast
• MountainFort
• Scar
• Suez

Game Modes
• RUSH
• CONQUEST
• TEAM DEATHMATCH
• BREAKTHROUGH
• DOMINATION
• POSSESSION
• AIR SUPERIORITY

Also discovered were some subtitles from the campaign alongside the names of some of the characters saying those lines. Those images can be seen below.

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Other pieces of information include stats for "horse killed" and "horse wounded." There is also a "Zeppelin Raid Medal" and a discovery that the Veteran Battlepack is again in the game. It's also interesting to note that there are six files listed with the name of "M_PatchFrance" and not much else to go on. There were some additional audio files linked in a Dropbox, but that link seems to have been saturated as of the time of this posting.