According to Twitter tech experts, the iPhone 7 will support fast charging of at least 5 volts/2 amps. That's up from 5 watts/1 amp on the iPhone 6S. I don't know entirely what that means, but apparently it means it's going to charge real quick.
Although it's just a rumour, it is backed up by an image of two different logic boards - one taken from the iPhone 6S and the other that is meant to be from the iPhone 7.
There's also been rumours that the iPhone 7 will also have a bigger battery life, which is good news for any Apple users used to seeing their phone hit single digit battery life.
We'll know exactly what's going on with the new iPhone on 7 September, when Apple are thought to be launching their latest model. But until then the best we've got is the rumour mill.