GameSpot posted a hands-on report
on Fable: The Lost Chapters for PC. Some highlights:
The new content in the PC version is literally a lost chapter that was cut from the Xbox version, so we can expect a slightly longer game as well. This new content includes nine new regions to explore, 16 new quests, new monsters to battle (including an impressive ice creature), new "expression" animations (such as the ability to play air guitar), new weapons, armor, and accessories (such as hats and other headgear), and the ability to create and import your own tattoos to plaster on your character's skin.
...as expected, the PC version boasts higher-resolution textures, so everything looks better, as well as higher resolutions in general, so everything looks crisper. Another benefit of the PC version is much quicker load times, particularly when you transition from one area to another.
I have to say I'm looking forward to this.