Well you guys are lucky - I'm having problems.
I'm going to list my steps for anyone else going through this, maybe we can get somewhere:
I basically made a C2 (R233) project that is as simple as can be (just one sprite that you press to display text), exported with Cordova (did not have any permissions selected, such as "media") then started a new Intel XDK project (made sure to have the latest XDK) selected the project.
First problem: Upon importing HTML5 code, I get the error: "Error creating project: Import directory contains Intel XDK files". I do see an XDK file in the Cordova export directory, so I simply delete it. Then the project loads fine into XDK. In XDK, I select the tab to "test", I then select the button to push the files to the testing server and read the QR code from the App Preview app on my iPhone 6 and iPad.
My iPad (not ios10) loads the app fine.
My iPhone (has ios10 installed) gives the message: Index.html Error fetching data.js
This happens when I export cordova with and without the WKWebView selected.
Edit to add: Got instruction from the XDK forum to change a line in the c2runtime.js file, which worked (as far as getting the program to run on using XDK's "test" with the QR code and app preview app. I haven't tried it yet downloading from iTunes. Here is the line change:
Replace the line: this.isWKWebView = !!(this.isiOS && this.isCordova && window.indexedDB);
with the line: this.isWKWebView = false;