I guess that I'd be better off just using the individual components instead, for now. With the new version it feels like they've switched from being a fairly plain "distribution" of Scala/Akka to more of an opinionated tool set based on giter8 and sbt. That's a pretty big jump, and I'm hoping that the lack of command-line support tools is something that's fixable once things are settled a bit.
If so, you can get one by entering the command 'sbt console' in a project directory. This will give you a scala console with the added bonus that all of the files in your project will be loaded as part of the REPL's classpath.