With the fact that some pre-order buyers are already not receiving a Watch until August, it seems safe to say that Apple would make a lot of early adopters unhappy by releasing a new Watch next April when many are already receiving the first-gen over the summer. In my opinion Apple launched the Watch in April to not only build demand that leads into the holiday season but to also gauge SKU demand and gain user feedback so that they can spend a longer-than-usual cycle developing Apple Watch 2. All of Apple's major products eventually move to a fall schedule, so I would expect Apple Watch 2 won't be released until September 2016 at the earliest at this point since Apple was not at all ready to meet demand for the first Apple Watch.