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I don’t believe this is a significant shift away from Android for Samsung. They have made no secret that they have been developing Tizen for some time now, yet there appears to be a strong ongoing relationship with Google.
The most likely reason for going with Tizen on the Gear series is simply that Android doesn’t work that well on low powered devices. Tizen apparently is somewhat more efficient with resources, so it made sense to go with it in order to have wearable tech that works more smoothly that it would with Android. Plus Tizen and Android are closely related, so it wasn’t a stretch for Samsung.