Google Image Search on iOS 7 seems to have reverted back to the legacy interface.

Instead of showing a full screen preview of the image, it is now showing the image as an overlay above a framed in view of the source of the image.

You can see a before shot from a post I have in 2012.

Here is what I see now on my iPad running iOS 7:

Google has not yet confirmed the bug, but there are dozens and dozens of complaints about it in the Google Web Search Help forums over the weekend.

Searchers are saying:

Is this a bug or Google reverting back to the old interface to appease some webmasters? I doubt Google is reverting anything.

Forum discussion at Google Web Search Help.