It isn't a Pages thing, but it is an iCloud thing. I just did a test in ByWord (which I have set to sync on iCloud).
I am sitting in a hotel room with my MBP, iPhone, and iPad all up and running on the wifi here. It has a decent speed and I'm able to stream videos without lag.
I created a plaintext file on each device. I titled it 'created on X' and named it accordingly. The content of the plain text file is 'this is a test'.
On the iPhone.
Each three documents are there in the list. I cannot access the iPad document and I get an error. I can open the MBP document.
On the iPad.
Each three documents are there in the list. I cannot access the iPhone document and I get an error. I can open the MBP document.
On MBP. I (naturally) see the correctly titled MBP document, but the other two are entitled "untitled1.txt" and "untitled.txt". I cannot open those two documents.
----test----
Created another 'created on X again.txt' document on both ipad and iphone. I then deleted the original problem document from each source.
Weirdness. As I was naming the document on the iPhone... as I was typing the title I got an error message that two versions were in conflict, the iPhone and the MBP and to choose one. At that point all I had typed was 'creat'. The app crashed and I restarted. There was the list of 7 documents on my iPhone with three of three starting with 'created on' but only 1 document named 'creat' and this one had a red C on the corner letting me know it had a conflict. I selected it and finished naming it to 'created on iphone again.txt' and the conflict was resolved. There was NO document present on MBP.
iPhone.
The 'created on the ipad again.txt' document did not come over. It is 'untitled.txt'. I selected it to download and it went into 'downloading item' mode on the bottom of the app and in the top bar. Until I did this (after 15 minutes of looking at it) there had been no visible downloading activity on the iPhone. After five minutes of 'downloading item...' it stopped trying. I selected the document again and it started downloading again.
The origional 'created on the ipad.txt' document was deleted from the iPad. However it is still listed on the iPhone.
iPad
The 'created again on the iPhone.txt' document is visible but cannot be viewed, another error. The 'created on the iPhone again.txt' document is visible but cannot be viewed, giving me an error.
The original 'created on iPhone.txt' is still present, though I deleted it on the iPhone.
MBP
I only got 1 document to show up and it is entitled 'untitled.txt'. I do not know from which iOS device it is from. I cannot open it.
All in all I've lost what little faith I had in iCloud syncing and I've watched/listened to 3 straight Sportscenter episodes. I hope Urlacher's knee will hold out this year.