Java inner classes haven't changed since the late 90's. There have been new features added to java over the last 12 years, but it still feels like the language I've used since the late 90's.

http://en.wikipedia.org/wiki/Java_version_history

language changes in java since 2000:

JDK 1.3 synthetic proxy classes (seldom used)

JDK 1.4 assert keyword (seldom used)

JDK 5 generics, enums, autoboxing, varargs, annotations

JDK 6 nothing

JDK 7 project coin (collection of minor language tweaks)

As for the stuff they "ripped off from C#" I'd like to see you name some examples that weren't already present in other languages. If anything it could be argued that some of the newer C# bits are just ripping off Scala features.