Wi-Fi 802.11n can at least provide 72Mbps transfers - provided all other system parts can keep up. K1 DNG files are generally 40-50MB - so around 7 secs to transfer each RAW image. Theoretically 600Mbps could be achieved using 802.11n, so maybe 1 sec/image.
Using the latest, fastest Wi-Fi 802.11ac standard would restrict compatibility, as it is only available using 5GHz and thus is less widely supported. Using 802.11n on 2.4GHz gives universal access and few downsides.
If you had a lot of images to transfer, putting the card into a reader (or using USB cable) gets you 312MB/s... ...which is at least 4 times faster than the fastest real-world speeds you could possibly achieve using the very latest Wi-Fi. (Assuming the SD card could really work that fast)
USB C with PD, Wi-Fi 802.11n and Bluetooth 4 all sounds like a good progression from the K-1 and previous APS-C cameras. I'm looking forward to it!