Samsung is said to be working on yet another smart watch model expected to be unveiled this summer — one that would completely replace a smartphone rather than simply being an accessory to one. In addition to taking calls, the new stand-alone watch from Samsung is expected to capture pictures, send emails, and include integrated GPS, Bluetooth and even a heart-rate monitor. The rumored device would essentially be a wrist-bound smartphone, which is very different from existing smart watches, which offload battery-draining duties to wirelessly connected smartphones that must be in proximity.