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Networking: Dual-band 5Ghz 802.11ac / Low-power World Band LTE and Bluetooth 4
The iPad Air saw an improvement over the built-in wireless networking capabilities of the New iPad, the iPad 3 and iPad 2 with a dual spatial stream, dual antenna 802.11a/b/g/n transceiver. This effectively doubles the previous generation's wireless networking speeds from 65Mbps up to 150Mbps, provided the Wi-Fi infrastructure and broadband connection supports it.
We expect that Apple will eventually move to Qualcomm's latest WCN3680 Atheros 80211ac-compatible chipset which will allow the iPad and presumably the next version of the iPhone and Apple TV to communicate using anywhere between two and four spatial streams, enabling the device to transmit and receive data up to 300Mbps to 450Mbps, and with longer range and less power consumption than its predecessors.
802.11ac capability would of course require upgrading to an 802.11ac-compatible wireless router as well as updated Airplay-compatible devices in order to fully take advantage of the new chipset, so presumably a new 4th-generation Apple TV and a new version of the Airport Extreme is also in the offing.
The upside of this increased speed will be much smoother playback of 720p and 1080p streamed Airplay content from the device as well as more responsive, higher-fidelity screen mirroring.
An updated Qualcomm Atheros chipset in the iPad Air 2/iPad mini with Retina Display 2 and iPhone 6 would also mean updated, more power-efficient world phone + multicarrier LTE capability as well as an updated, more power-efficient Bluetooth 4.0 implementation as well.