Via NikonRumors, this is something everyone should know about: a do-it-yourself $30 wifi kit for the Nikon D4! It really speaks for itself. Read on for the details. Who knows, maybe something similar could be done for the 1D X. I wouldn't be surprised at all...
This is what NikonRumors had to say:
The NR reader Voudas sent me this inexpensive alternative for controlling your NikonD4 camera through WiFi:
"The idea was to connect the small VAP11G portable WiFi bridge device (available on eBay and Amazon) to the D4's Ethernet port in order to use it through WiFi. I setup the Ethernet connection of the D4 and then used the VAP11G device to connect through my WiFi. I then used my laptop and iPhone to check the WiFi connectivity with the D4. It worked like a charm!
The limitation of the device is that it didn't act as an access point - it would always need an established WiFi network, but the important thing was to prove that the price of the WT-5 price is ridiculously high ($877) and the VAP11G does the same thing for around $30. This limitation could probably be eliminated with the Asus WL-330gE wireless access point."
Hear's a link to get that bridge device on Amazon.
I knew this would happen, I'm just surprised it happened this fast. Within a few months I bet there will be one that works the exact same for $99. The markup on this is crazy and that opens the doors for third party profit.
April fools?
Since wireless solutions from the manufacturer themselves are so pricey I've been keeping an eye on WiFi alternatives - there are a few around - be it for tethered only or additional functionality. (Currently shoot a D200 - no EyeFi cards)
One of the problems with this and others is power - can get cumbersome if you add a battery pack.Not such a problem if the camera is static, but is when using it for mobile tethered shooting.