It's a better programming language overall. Developed by Jetbrains who know what programmers want out of a language (they also developed the IDE for it). It supports multiple programming styles & the community has built up around it like that.. for example if you're into functional programming, go for it, if you prefer OO, that's fine too.
OTOH it provides you with more than enough tools to shoot yourself in the foot with both barrels, reload then fire again. Which I predict plenty of people will do once it gets more popular.