The Apple Watch comes in three different materials - aluminium, stainless steel and gold. Apple could be planning to use its new Watch aluminium alloy for the body of the next-gen iPhone 6S.
The report comes from Taiwan's Economic Daily News, so is far from confirmed, but it makes perfect sense.
Apple claimed that it needed to come up with a new aluminium alloy for the Apple Watch Sport. The series 7000 alloy contains zinc and magnesium, but the key point for Apple is that it's just as light as other alloys, but 60 per cent stronger.
If there was one thing that blighted the launch of the iPhone 6, it was the bendgate furore surrounding the iPhone 6 Plus. Using a stronger alloy might overcome that problem.
Apple sticks to a 2-year design cycle for the iPhone. The iPhone 6 and iPhone 6 Plus introduced a new design, so we'd expect 2015's iPhone 6S to stick to the same design.
Often there's a bump in the processor on iPhone S models, but it might be that Apple opts to change the case materials for the new device, before introducing a new iPhone design for the iPhone 7 in 2016.
There are also rumours circulating that Apple might incorporate one of its other new technologies - Force Touch. Again, it makes sense for Apple to unify interaction experiences, and with Apple Watch and the new MacBook offering Force Touch, we expect more devices to follow suit.
We wouldn't be surprised to see a new iPad Air launched with Force Touch, as well as the iPhone 6S with Force Touch, united under an iOS 9 umbrella.
We'd expect any new iPhone model to be announced in October 2015.