There are several differences. Firstly it's only triggered when you pull past a certain threshold, and secondly it refreshes all new items - not just the ones t

There are several differences. Firstly it's only triggered when you pull past a certain threshold, and secondly it refreshes all new items - not just the ones that cover the uncovered scroll region. It's also cancellable before you reach a certain threshold, and clear feedback is given about this. Regardless of where you stand on patents, this is certainly not the same as infinite scrolling.