XM Satellite Radio is expected to unveil a “wearable” device next week that will allow users to not only listen to XM content but download it to a built-in hard drive as well. An XM spokesman declined to comment beyond saying a major product announcement was planned for Oct. 26 in New York. “XM is also likely to announce its wearable device next week. There is a good shot this ‘Walkman’ type device, in the near term, will differentiate XM’s hardware from Sirius,” said Kit Spring, analyst with Stifel Nicolaus.