The EV3 uses a Panasonic PAN1325(A) bluetooth module with a Texas Instruments chip. It is Bluetooth 2.1 + EDR.
Early models have Panasonic part number ENW8918A2JF with TI part number CC2560.
Staring around July 2015, EV3s started shipping Panasonic part number ENW8929A2KF with TI part number CC2560A instead.
hciconfig -aindicates that the newer chips are BT 4.0, but they don’t actually support BTLE).