The original Fable was a pretty good Xbox game, but originally it was meant to be a lot more than they released. They had plans to make it something of an MMO, and one with some pretty ambitious features compared to other MMOs which were out at the time. So when I saw an ad for
Fable: The Lost Chapters I'd kind of hoped they were planning to give it another go, and put back some of the things they'd been forced to take out - but it seems not, this seems like a simple XBox -> PC conversion, with a few smallish extras thrown in.
Anyhow, if you enjoy single player RPG games (this is comparable to KoToR in some ways, ie that you can shape the progression of your character by the choices you make) and didn't play Fable on the Xbox, then you might enjoy this.