JetBrains should buy them and integrate all these wonderful features into Intellij. That might be the most powerful IDE ever made!
If JetBrains bought it and integrated it in IntelliJ that would end killing the original project and I'd be forced to go berserk on Prague, big time.
Anyway, this is all speculation.
It's 2013 and we generally still use text editors to work with code. The result is that code is typically tied to plaintext buffer by hacks and kludges in a quite awkward way. Highlighting is done by one subsystem, code analysis (if any's possible) is performed by completely another one (so highlighter output may accidentally contradict code analyzer), folding is totally separate from all those, and so on.
JetBrains has another approach to this, as most clearly seen with MPS.