When should we expect Ktor version with support of 1.3 and stable coroutines? I’m ready to try snapshot version on our project

You can try it already: https://bintray.com/kotlin/ktor/ktor/0.9.5-alpha-4-eap13 or do you mean the final version?

early preview:

0.9.5-alpha-4-eap13

Nope, snapshot is fine. Will update and report if find any problems Thanks 👍