It will be an attempt to make the app feel more like it is OS native, and less like a website. The UI should be able to provide clear signals about what is interactive and what is not. If a user is relying on the cursor to change to indicate an elements inter-activeness, then the user experience has not been considered enough. In a website the hand pointer is used as text links or even image links do not always clearly provide clues to whether they are interactive. No hand pointer is a clear indicator the link is not actually a link.
The clear benefit to me of not using the hand pointer is that the design has to provide all the clues required to indicate an interactive element making for a better user interface design. A touch screen targeted interface has to be designed without the hand pointer with no detriment to the user experience just like a desktop one can.