The new iPhone will include the A5 processor along with an 8-megapixel camera, the report said, quoting two people familiar with the plans.
Apple is also testing a new version of the iPad that has a higher resolution screen, the report said, adding a cheaper version of the iPhone aimed at developing countries is also in the works.
Apple shares fell to $323.85 in trading before the bell on Wednesday. They closed at $325.30 Tuesday on Nasdaq.