Digital Expert has posted some pics related to the unreleased E10. It seems that it will use the same interface of U10 and will be available in two colors, white and black.
The black part on top of the player seems to be the infrared interface. If E10 sports an infrared interface, it can be used for two purposes. Firstly it can be used for transferring music from a compatible infrared device or like many mobile phones it can be used as a remote control. Though transferring data via infrared is slower than USB but it gives way to transfer data wirelessly.