I think the Oracle/Google lawsuit drove the decision to adopt Kotlin. Now Google is going to work with JetBrains to develop Kotlin and is going to fork the GPL JVM probably by not including things like the controversial project Jigsaw that IBM voted down. Meanwhile, Oracle is stuck with Java, just like they're stuck with OpenOffice, Hudson, etc.
Nah. What drove the decision is that huge swaths of Android development community already adopted Kotlin and it's trivial to implement it in existing Android codebases. It's also built by a company with which Google already has partnership with (IntelliJ built both Kotlin and IDEA IDE which is the base for Android Studio).
Jigsaw would actually help android. The entire reason Google went with their own implementation in the first place is to exclude certain APIs that were meaningless on android.
