We can probably assume that all new EOS models will have WiFi as standard, although with wireless EOS Utility now a core feature on the 6D, it must not resonate too well with those WiFi-less 5D3's and 1DX's.
It definitely resonates which is why Canon launched the two new WFT-E6 and E7 wireless file transmitters with the 1Dx/5D3... the included wifi on the 6D has definite limitations, you're not going to be able to transfer RAW at high FPS rates etc at wireless N speed etc... I read an article on it last week, it's a watered down feature compared to the external transmitters...but it's an enthusiast camera so that's fine for the 6D. My guess is they'll include it on the 7D2 just to give them another "added feature" but I think prosumers and pros will find it lacking in speed and other functions compared to the external transmitters...there's a reason those things are $600-700 each. from Canon USA:
Wireless LAN support for IEEE802.11 a/b/g/n, delivering ultra-fast image transfer speed
Support for wired LAN Ethernet-1000BASE-T for high speed communication
Enhanced linked multi-camera shooting
Media server (DLNA) supported
Wireless time synching
Bluetooth-compatible GPS devices can be connected wirelessly
USB terminal for easy connectivity
"The WFT-E7A is compatible with the EOS 5D Mark III SLR and offers a wireless-only LAN function for enhanced versatility when transferring data. It supports IEEE 802.11 a/b/g/n network connections, providing safer and faster wireless LAN transfers. It has a new image resend feature that ensures all images get transferred, even if a wireless signal drop interrupts transmission.
Wireless connectivity is gradually becoming an industry standard; many photographers are seeking convenient methods to transfer important image data securely and faster without the use of cables and wires. Canon developed the new WFT-E7A to support IEEE 802.11n, which provides seamless wireless transfers of large files at a speed roughly 3x faster than IEEE 802.11 a/g.