Unsurprisingly, iPhone 6 and iOS 7 has been reportedly in development as many devs have noticed iOS 7 and “iPhone 6,1” flags have shown up in the app usage logs. The Next Web has traced the IP showing up in the logs to have originated from Apple’s Cupertino campus, meaning these flags are most likely not faked.
Currently, no official announcement or acknowledgement of iOS 7 or iPhone 6 has been made from Apple, but the probability that Apple is working on both is extremely high. At this point, we can only speculate if iPhone 6,1 means an actual iPhone 6 or simply an iPhone 5s. Read more about the flags here.