Non-parallel collections should work in first developer preview (to be announced.) Parallel collections may took a few release to get working.
> Q: Cross-platform support? If I wanted to run this on iOS and Android today, what do I have to do? What about on Windows or OSX?
If you can compile and run C code with Clang on some platform, it's reasonable to expect Scala Native to be run there eventually as we're based on the the same underlying compiler toolchain. Currently we mostly aim at POSIX environments.
> Q: How does GC work? Is there a way to take more control over GC for Scala objects?
Boehm GC for now, but that's not our long-term strategy.
> Q: Is it possible to ‘link’ in external dependencies, i.e. Joda Time. How do I do this right now?
We can link with libraries via C ABI. Java libraries need to be ported over to Scala.
> Q: Does the compiler use a translation layer? If so, is it consistent with Java 7 or 8?
We strive to keep the same semantics as Scala/JVM.