random, shuffle (both of them now JVM only) -
https://youtrack.jetbrains.com/issue/KT-17261
file I/O - are you talking about multiplatform? There are plans about async file io lib, but not sure that it will be available for multiplatform. Also not clear how js implementation should work (node.js only? not really Kotlin JS way)
constructors for Map and Set? What do you mean
JVM like collections is actually interesting proposal, not sure what is position about this