It's that time again: Apple (AAPL - Get Report) is expected to release three new iPhones this fall. 

That means rumors are flying about what the new phones will look like -- and what it means for Apple, which earns more than 60% of its revenue from iPhone sales. Apple typically unveils new phones in September, and new iPhone models and features are a closely guarded secret. 

From SIM card slots to fancy new colors and features, TheStreet breaks down some of the biggest iPhone rumors to emerge so far.