When Groovy's two biggest users (i.e. Grails and Gradle) each release a major point version (Grails 2.1 and Gradle 1.0) less than a month before Groovy 2.0's release, that says more about what their project managers think about Groovy 2.0's production-readiness than anything they or anyone else might say.
Groovy 2.0 bundles two jars, one for Groovy scripts using Java 7's invoke-dynamic, the other for scripts using type-checking and static compilation available via optional annotations. Invoke-dynamic and type-checking/compilation _can't_ be used together: you need to choose only one jar to use. The roadmap plan is for them to be merged together in Groovy 2.1. Groovy 2.0 should never have been released until it was a single functioning jar.
I don't see the lack of faith thing as much as you. I see it as the features those projects have been working on don't rely on any Groovy 2.0 functionality, so they'll push it out sooner and give people more functionality in those projects now, and explore the impact on Groovy2 on their respective projects after it's release and shakes out.
Groovy 2.0 bundles two jars, one for Groovy scripts using Java 7's invoke-dynamic, the other for scripts using type-checking and static compilation available via optional annotations. Invoke-dynamic and type-checking/compilation _can't_ be used together: you need to choose only one jar to use. The roadmap plan is for them to be merged together in Groovy 2.1. Groovy 2.0 should never have been released until it was a single functioning jar.