Change effective on 18 August 2014
Heroku Scala support will now prime the sbt dependency cache before building an application for the first time. This will reduce the overall build time for both Play and standard sbt applications. Standard sbt applications will also see a reduction in slug sizes as the dependency cache is no longer included in the slug.
For more information on Heroku’s Scala support, see the Dev Center article on Getting Started with Scala.