The Adafruit Feather 32u4 Bluefruit is an 'all-in-one' Arduino-compatible + Bluetooth Low Energy with built in USB and battery charging. Its an Adafruit Feather 32u4 with a BTLE module.
Version 1.6.4 of the Arduino IDE introduced official support for adding third party boards (like the Adafruit Flora and Trinket) to the new Board Manager.