Combine bundle.watch with gulp.pipe, or have callback on a complete iteration

Hi, I need to deploy my assets to multiple directories, after they've been built by the `bundle.watch( options )` command. Ideally, the one of the directories will have an ENV variable as part of the path. 

Is there a callback function for when an iteration of the watch cycle completes?
or can I combine `bundle.watch` with `gulp.pipe`, so as to deploy to multiple destinations?

Thanks!