A follow-up model of the world's smallest mp3 player with display DAH-1500i has been developed by Korean Mobiblu.

The new Mobiblu Cube 2 has the same measurements but features a color OLED display and new control buttons. It is a pity that the OLED screen is not big enough to cover the whole side of the cube.
The screen looks out of proportion with the big borders around it. This was ok with the original cube because the surface was mirrored and the blue text display floated in the center of the surface. Now with the color display the border is too visible.
There is no release date yet and also no official information from MobiBlu directly available.
More details on popco (Korean). Via Dap Review.