Included within the esp32 repository as well as the recently added one from heltec ( https://github.com/Heltec-Aaron-Lee/WiFi_Kit_series ) is an example for using Bluetooth. I just gave it a try but besides advertising its name via BLE there is nothing else supported yet :(

One can not even pair this device yet, just update the advertised name. At least, this can be used to broadcast some sort of  data - e.g. temperature and humidity from a connected DHT22 or DS18b20... 

Once espressif has their repository updated and full bluetooth/BLE support added, a number of interesting applications come to mind: e.g. a Bluetooth to LoRa bridge for a long range bluetooth chat.