Seeing what has been done for Java with Xtend and Mirah I can't help but think someone must be playing around with something similar for Objective-C or even C and C++ for that matter.
After some searching I've come up with nil. Is anyone aware of a CoffeeScript like Objective-C implementation?
Update: Good input so far from the two that have submitted answers, however wouldn't it be superior (realizing that that's a little subjective) to have an intermediate language that compiled directly to Obj-C precisely as per how CoffeScript works? Now, I'm not asking for CoffeeScript mind you, but rather some language that doesn't compile directly, but rather gives you a more readable top layer syntactically a la Xtend.