Got some news from a KZ rep:
The KZ SK10 will be releasing next week. 1 BA + 1 DD hybrid configuration. Could this be the CSN in TWS form? Also is still AAC limited and might actually be using the same chip as the AZ09. Pricing would be about 40 USD, give or take.
EDIT: NVM. It doesn't use the same BA as the CSN. Might be an "updated" SKS?
I'll be able to share my impressions a week after it releases (review unit)
Oh, another update for those interested in their wired IEMs - I was told that KZ is currently focusing on Bluetooth transducers. So the electrostatic (if it will push through) might not be seen in the near future