There was some discussion, but nothing done yet.
My preferred solution is mangle JS as part of install/upgrade, so we keep uncompressed JS in CVS - and have a way to turn it off, so developers working on JS are not inconvenienced.
However, a prerequisite to anything like that is getting all JS into external .js files, and including it all with require_js. The existing require_js API is nice and simple for developers, and yet gives us all the flexibility we need to manage which actual file is included behind the scenes when a developer asks up to include a certain bit of JS, for example switching in a compressed file.
However, there is first a big job going through the code and making everything use require_js.