Just curious, how do you figure Kotlin is over-hyped? Seems to me it has good tooling support, incredibly easy Java interop, and seems to produce more or less the same JVM code as Java (so good performance). All the while being slightly more pleasant to work with.
I think it's strictly worse than Ceylon - less mature, less featureful, and a lot less well designed.[1] And JetBrains have a bad habit of advertising features long before they're actually implemented, as well as talking up Kotlin for about a year and a half before it had any kind of stable release.
[1] And frankly if there's nothing it can do that Scala can't and the design isn't any cleaner than Scala (arguable, but I feel Kotlin is very ad-hoc and will look worse than Scala by the time it reaches the same age) then I'll just stick with Scala - whereas Ceylon can make at least some case for migrating from Scala.
