Comparing the photos to my Pi 2, it doesn't seem very different. There's an extra IC near the microsd card, a connector beneath the HDMI port, and a few other small changes.
But nothing that looks like an antenna. Any idea where that might be?
Edit: as lovelearning pointed out, there is a small ceramic-looking piece in the upper-left of the top side, near the GPIO pins and LVDS display connector. That might be it.
Also worth noting: the new IC and the suspected ceramic antenna are in about the same place on opposite sides of the pcb. So I think that lends some credence to the idea that is is an antenna.
First thing that came to mind. All the wifi ready SBC have a very easy to spot chip and some form of visible antenna. I'm almost thinking the shots were just for gross form factor approximation.
Second last "internal" photo, top left corner next to the ribbon connector. That thing that looks like a long cap SMD is the chip antenna (just guessing).
But nothing that looks like an antenna. Any idea where that might be?
Edit: as lovelearning pointed out, there is a small ceramic-looking piece in the upper-left of the top side, near the GPIO pins and LVDS display connector. That might be it.