I've been dealing with this problem for three weeks now. The tech support rep is very polite, very friendly, but it's always something "the engineers are looking into" and I'll "hear back from us in a couple of days." Which usually means five days or more.
My problem is even weirder in that not only will the iPad and iPhone not sync iWork files to the iCloud, but on those devides my Pages app has dozens of old files--many of them NOT Pages files--that keep coming back no matter how many times I delete them (if I even can; many just sit there as ghosts). These do not appear in iCloud on either my Mac Pro or my Mac Book Pro. Nor are they native to the iPad; this is an iPad 3 on which I did a cold setup to start with, and none of the mysterious files in question were uploaded via my earlier iPad.
The last story--last Thursday--was, "The engineers want to scrub out all of those files." Okay, I said, go ahead. Well, here I am six days later and nothing's been done.
This is extraordinarily frustrating, not only because I cannot use iCloud the way it would be most efficient for me--i.e., to push documents there so that when I travel I can take only my iPad unless I absolutely need a "full" computer--but because Apple's technical support, which I have consistently found to be superb, is dragging its heels and basically accomplishing nothing. I realize with the release of Mountain Lion (and its problems, especially in respect of Mail and Calendar), the "engineers" are probably quite busy, but when you tell a customer something will be addressed "in one or two days" or "immediately," that's when you should address it.