Google has already submitted a Google+ iPhone app to Apple App Store, and says it is waiting for approval.
“For my iPhone-using friends: the Google+ iPhone app has been submitted to the App store (no, not today, sometime prior to today) and is awaiting approval,” said Erica Joy, a support technician at Google, in a Google+ post spotted by Mashable. She clarified in a comment that it’s for iOS devices, not just for the iPhone.
so according to Apple’s standard approval process, we could see the app as soon as this week.
Google launched Google+ with an Android app. The Android app is geared for small devices, though; it’s workable, but awkwardly stretched, on the Samsung Galaxy Tab 10.1, for example. Apple’s iOS devices, though, are pretty popular, especially among the digital in-crowd which has managed to obtain Google+ throughout its limited first beta period.
One Google technician does mention that she does not know when the app will be launched for the iPad, but does not believe it will be at launch.
Google has also said that it will provide a Google+ API (application programming interface), allow it to be used by other programmers to build Google+ apps. An API lets software, not just people, interact using a service, so that programmers can create a new interface for a service or potentially build broader services on top of it.