Two recent patents reveal design of what looks like probable smartwatch from Microsoft. One of the patent shows what Microsoft mentions as Fitness band and as per the patent it can be used for tracking heart rate with help of a sensor on the back.
The second patent is about “The ornamental design for an electronic band” which has a big display area (for smartwatches) and looks quite sleek. The design is similar to what we see in the first patent.
Now, there has been rumors about Microsoft foraying into smart wearables, so it is not surprising at all, if this sleek design comes into being a real smart fitness band or smart watch.