The patch notes were a long list of small fixes and tweaks -- things like "moved a tire that was sticking out of a wall," and changes to recipes, creatures, and mechanics. But these few hundred little changes weren't what made everyone sit up and take notice.
The graphics were given a significant overhaul resulting in a completely new look for the game; specifically the terrain and skies. Along with cloud movement, players will notice much more detailed and realistic surroundings both far and near. You can find some great before and after comparisons at Ten Ton Hammer from FE Graphics Programmer Kevin Coyle
The full patch notes are worth a read (you'll need to be registered on the forums to view them), but this extensive update isn't the only thing the Fallen Earth developers have up their collective sleeve. If you haven't yet checked out our interview on Massively Speaking, take a listen to see what else is coming up.