A heads-up, the old Zinc project under typesafehub/zinc (currently used by Gradle) is being replaced by sbt/zinc and the first release milestone of the latter is now available:
Zinc is the incremental compiler for Scala, originally part of sbt,
but now split up as a library. Unlike the older Zinc that was repackaged out of sbt artifacts,
this new Zinc is a genuine project built from source, published to Bintray and synced to Maven Central.
Zinc 1.0.0-M1 is cross built for both Scala 2.11 and 2.10, and
features class-based name hashing implemented by Grzegorz Kossakowski (see  for the correct pronunciation)
A discussion on what is planned is taking place in issue 80 (unfortunately, I can’t include the link due to anti-spam restrictions in this forum).
It would be great for the Gradle project to eventually start using the new Zinc, so it may be worth participating in the ongoing discussion.