Multiple folder pages are really great for me, and were my main reason for jail breaking. But like the OP, I'm a little disappointed that they appear to be limiting the number of icons on a single folder page to 9.
With ios6 on an iphone 5 we can get 16 on a folder page.
Hard to tell from the Demo if that limit has really changed, if it's just the way they show a folder when the folder has fewer icons, or it's its configurable? Do we only get 3 across now, and only 3 rows, regardless of the total number of icons in a folder?