The classifications listed for the European trademark of Healthkit are as follows:
That is a very exhaustive list, although quite a large portion of that list are essentially synonyms for "watch". The rumors have said for a while that a potential iWatch would be focused on health, fitness, exercise, and wellness, which covers the first section of the classification list. The middle section is a mess of words that all mean the same thing. But, it is that last one that is interesting: jewelry.
We know that at its heart, Apple believes itself to be a fashion brand. Owning an Apple device is a fashion statement. As we mentioned, that was likely part of the reason why Apple recently purchased Beats. There have also been rumors that Apple is working on both a sport version of the iWatch as well as a fashion version, which could connect to the jewelry classification here. Time will tell.