Yes, all the higher end and metal clad Canon bodies use a separate/external WFT module instead of built in WiFi.
Among the APS-C crop sensor models, the models that use a WFT module include 40D, 50D, 7D and 7DII. Among the APS-H and full frame models, most of the 1D and 1Ds series use a module, and so too do the 5D Mark II and Mark III.
Partly this is said to be because of interference with the WiFi signal from the metal (magnesium) body panels. The WFT modules have much, much greater range than built-in WiFi (200 to 400 ft vs 15 to 30 ft) and generally faster, more reliable and secure data transfer.
Depending upon how far from your camera you want to control it, you may be able to tether the camera to the iPad with a cable (I believe you'll need some sort of adapter for the iPad, since it doesn't have a USB port). It's not wireless, of course, but might do what you need it to do.
In either case, wired or wireless, in order to control your camera, you'll need to install EOS Utility on your computer.
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Alan Myers
San Jose, Calif., USA
"Walk softly and carry a big lens."
GEAR: 5DII, 7D(x2), 50D(x3), some other cameras, various lenses & accessories
FLICKR & EXPOSUREMANAGER
