The nice!nano is a Bluetooth enabled, drop-in replacement for a Pro Micro. The target price is $22 per board with an expected MOQ of 200 and maximum order of 1,000. It is compatible with QMK forks, but utilizing the BlueMicro firmware seems to have a brighter future. Guides will be made about how to use either.

Join the Discord for any of your questions and for faster updates/discussions: https://discord.gg/CHd6hUy

Features:
 - Mid mount USB-C port making the board a 3.2mm total thickness (thinner than a Pro Micro)
 - Extra exposed pins to add a rechargeable lithium battery
 - Works over USB as well
 - nRF52840 chip on board with 1MB of Flash and 256KB of RAM
 - Adafruit Bootloader loaded offering DFU flashing as well as flashing via UF2 storage (similar to dragging a file to a flash drive!)
 - On board lithium battery charger through the USB C port (100mA charge rate)
 - Extremely low power making the board capable of lasting a few weeks on a 100mAh battery
 - Programmable indicator (blue) LED as well as a charging indicator (orange) LED
 - Battery voltage reader to report battery percentage to main device
 - External power can be cut off using an on board MOSFET saving power from LEDs (each can draw 1mA when off!)
 - 5 extra GPIO pins (3 thru holes and 2 pads on the back) offering a total of 23 GPIO pins
 - 3.3V out of the VCC pin to power external features
 - 32.768 kHz oscillator on board for real-time clock capabilities
 - Clean design with matte black solder mask, immersion gold plating, and Tg 170 FR4 for durability