For a brief period on Friday, a set of what appears to have been "unfinished" or "rough draft" icons for iOS 7 appeared on a mobile version of the page
promoting the new beta instead of the icons that are actually included in the current beta. This is not the first time discrepancies between the current iOS 7 icons and alternative versions have been noticed: the presentation during the WWDC keynote on Monday also featured some that are not quite the same
as in the beta given to developers. Also discovered at the bottom of the Apple page was a picture of iOS 7 running on the iPad and iPad mini.
The icons were quickly set back to the current icon set, but the slip-up reiterates the idea that the icon set as seen today may undergo further tweaking before a final release, planned for this fall. Some icons, particularly the new Game Center design, have been criticized for being too vague and could well be temporary. One notable difference between the "alternate" set (seen below) and the current icons is the weather app icon, which in its "rough" form features live temperature to match the live clock face in the Clock app and live date in the Calendar app.
The live temperature icon idea has proven to be a popular notion, but Apple Senior VP of Marketing Phil Schiller had noted years ago that the feature was dropped because it could "waste battery."
The fact that the design was shown in the "alternate" set, which also features more visible gridlines of the sort featured in the promotional video for the forthcoming iOS release, indicates that Apple is now at least seriously considering the idea.