Okay we have an official super clear comparison between all the versions of this re-release, including a comparison with what will be in the 1.10 Patch for last-gen owners.
http://darksouls.jp/pc/scholar_of_the_first_sin_specmatrix.html
The chart is in Japanese, so I'll translate the column on the left indicating the features. The rest should be self-explanatory.
New Features:
- New characters and events (Included in all versions of SoFS, will be added in the 1.10 Patch for existing users)
- Story and world additions (Included in all versions of SoFS, will be added in the 1.10 Patch for existing users)
- Graphics and performance upgrades (Only included in next-gen versions of SoFS)
- Improved online multiplayer (Only included in next-gen versions of SoFS)
- Enemy and game design adjustments (Only included in next-gen versions of SoFS)
- Various balancing tweaks (Included in all versions of SoFS, will be added in the 1.10 Patch for existing users)
Included DLC:
- DLC1 (Included in all versions of SoFS, not included in the 1.10 Patch)
- DLC2 (Included in all versions of SoFS, not included in the 1.10 Patch)
- DLC3 (Included in all versions of SoFS, not included in the 1.10 Patch)
- Supports existing save data (Supported for all last-gen versions of SoFS and the 1.10 Patch, not supported for next-gen versions of SoFS)
- Game Server Region (PS3 = A, 360 = B, PC(DX9) = C, PS4 = D, XBO = E, PC(DX11) = F)
Distribution:
- Retail
- Digital