Mirko_electronics has unveiled the PicoBerry, a carrier board for the Raspberry Pi Compute Module 4 (CM4). Measuring in at 20 x 70 mm, the developer stresses that the PicoBerry is only compatible with the regular CM4 and not the CM4 Lite. Narrowing compatibility further is a requirement for eMMC flash storage, rather than a microSD card.
As teaser images show, the PicoBerry has a USB Type-C port, as well as a 40-pin GPIO header. According to Mirko_electronics, the former only supplies the carrier board with power, while the latter makes the PicoBerry compatible with all manner of HATs and other Raspberry Pi accessories. Theoretically, the device could be used with an external display too, further opening up its possibilities as a developer board.
Additionally, Mirko_electronics has included two user-controllable LEDs. Separately, the PicoBerry relies on open-source hardware, with its manufacturing and source files distributed via the developer's GitHub page. Unfortunately, Mirko_electronics has not mass produced the PicoBerry. In other words, the device does not have a retail price. However, you can contact Mirko_electronics, which should help with creating one of your own, should you wish to do so.
Source(s)
GitHub via Tom's Hardware