According to several news releases, iOS7 will take over the swipe up and swipe down commands. Grrrr. From the Telegraph (via MA):
A new way to access search
The ability to search on the iPhone and iPad has been around for a while, however, iOS 7 will introduce a new way of accessing it.
Simply swiping down on the homescreen will open a search box and the keyboard, allowing you to search without having to swipe to a dedicated screen as in previous versions of the software.
Swipe up to close Apps
Like in previous versions of iOS, double clicking the home button at the bottom of the phone will show all of the Apps that are currently open.
Simply swipe up on the screen to close the app.
One of my favourite e-readers on my iPad is Stanza, and one of the many reasons I like it so much is that I can swipe up to brighten the screen and swipe down to dim the screen.
iOS6 buggered things up for Stanza for awhile, and Stanza had to redo their app. And now Stanza will have to redo their app once again.
[and meanwhile, of course, Apple has still not addressed the segment of the market that would like a larger phone]