There are claims by two anonymous researchers in which they found a way to bypass the activation lock feature in iOS. I have not personally tried this yet, but plan to and will report back at that time. However, it's important to know in the meantime. 

Their attack focuses on buffer overload. One of the few things allowed from the activation lock screen is connecting to a Wi-Fi network. It's said that by crashing the service that enforces the lock screen by entering very long strings of characters in the WPA2-Enterprise username and password fields and in time freezing. He then proceeded to use an Apple smart cover to put the device to sleep and reopen after a few seconds later the Wifi screen crashes to the home screen bypassing the activation lock.