To be honest I would be disappointed if they let loose a macro system that is as incomplete as the C preprocessor. I'll be much happier if in a year or two they add a proper, more well thought out macro system to the language which aids in readability rather than ruins it.
Now, we'll likely not get the Lisp macro system in all its glory, but I think the point to take away (despite the short parent comment) is that its almost better not to have a broken macro system than something that is rushed an not properly implemented.
The C preprocessor is bad enough; it's much better if a separate macro language can be avoided altogether, leaving a single consistent syntax for the language. If there has to be a macro system, I would greatly prefer a simple preprocessor to a more powerful system that would allow even greater convolution of the syntax.