Apple may be planning to release a refreshed, SIM-card-free version of the iPhone 4 with a new 8 megapixel camera sometime in August 2011.

The latest rumor, reported by Macotakara, suggests that the next iPhone won’t be a significant departure from the company’s iPhone 4, and the major changes will come in the form of an ARM Cortex-A9 based processor, an 8 megapixel camera, won’t require a SIM card, and will be “world phone” capable. It was unconfirmed as to whether or not the new processor would be dual-core or single.

If the rumors are correct, it would mean that a single model would be able to support both GSM networks, such as AT&T, and CDMA networks, such as Verizon.

Macotakara also suggests that the next “major new handset” from Apple won’t arrive until 2012 – sometime in the spring. This timeframe for the potential “iPhone 6” was leaked by a Japanese newspaper in April, saying that Apple had selected Sharp to supply the display technology for the new handset.