I really wish Opus would make it into wireless speakers and headphones. From what I've read, it might not be the most power-efficient format, however, and those tiny earbuds need to be /really/ efficient. But I also suspect that popular wireless codecs (i.e. Dolbly's AptX, MPEG's AAC, and Samsung's Scalable) are powered by marketing fluff. I'd love an informed opinion :D
APT-x is very good, low latency codec. It's been around a long time and is not marketing fluff. Some AAC codecs are also very well made for specific purposes. Opus is too high latency for headphones.
Opus is specifically designed to be low latency. I'm not sure where you got the idea that latency would be a problem. Of all the lossy codecs, there isn't much that is faster.