I'm waiting for this one to show up too. Been checking every day, still nothing. I can't believe Amazon would hold up an existing, approved Skill the way they have with this. While I really enjoy the Echo Dot in many ways (hooked up to speakers for music is one), the missing skills is really irritating me.
The workaround I have for the moment is using IFTTT. That will at least let me toggle my LED strip on/off, which is better than nothing. Looking forward to having proper integration via the Yeelight app though.