Taking a peek under the covers of the revised AirPort Card, we find:

Broadcom BCM4360 5G Wi-Fi 3-Stream 802.11ac Gigabit Transceiver

Broadcom BCM20702 Single-Chip Bluetooth Processor with a High Performance Integrated 2.4-GHz RF Transceiver

Skyworks SE5516 Dual-Band 802.11a/b/g/n/ac WLAN Front-End Module