I tried to use new experimental tool chain for Android (Jack and Jill), but if fails to compile with:
Error:Could not determine the dependencies of task ':app:crashlyticsStoreDeobsXXX'.
> Task with path 'dexXXX' not found in project ':app'.
Crashlytics task depends on
dex task, which will not be created, because Jack does dexing internally. This is most likely something Crashlytics team will have to deal with soon and fix.