Perhaps, but the placeholder in the app store currently is for iphone and ipad.iPad Pro only...
But it could be an extra selling point for the ipad pro.
Iphone could very well be icloud drive only, and the ipad both. So you can download files into you icloud drive on the iphone and have the ability to drag and drop files from your icloud drive to files on your ipad pro.
If true, It will definately mean that 128gb will be the lowest storage tier for the new ipad pro' s. And a minimum for 4gb internal ram.