It's being developed separately from Scala 2. For example, it interops with 2.11 but not 2.12.
The Scala 2.12 compiler will soon compile the Scala 3 compiler [1]
I like to take a look at /compiler/src/dotty/tools/dotc to whet my appetite from time to time [2].
[1] https://github.com/lampepfl/dotty [2] https://github.com/lampepfl/dotty/tree/master/compiler/src/d...
does it break compatibility with current version of scala
On a different note: I've noticed that HN is starting by to develop the drive-by-I-disagree-voting that Reddit has. That's unfortunate.