Thanks, Tom; that extra-fine type is the only place it's indicated. Neither the full description nor the What's New part of the page makes that clear. Then when you look at the requirements, it references 10.7.4, not ML. And if it was on the main Apple site's Pages page, it was well hidden.
In the case of the current version of Pages: If the full benefits of the application's only available with the current OS, you make it clear and obvious.
As alluded earlier, Apple exercised the same ineptitude by failing to make it absolutely clear what hardware actually could run Mountain Lion.
Sad and annoying.