According to the article, C99 support was one of the motivations for doing this.
"As part of this work, we've completely rewritten the core implementations of the printf and scanf functions (now with no #ifdefs!). This has enabled us to implement the remaining C99 features for the stdio library, to improve correctness checks in the library, and to fix many conformance bugs and quirks"
"As part of this work, we've completely rewritten the core implementations of the printf and scanf functions (now with no #ifdefs!). This has enabled us to implement the remaining C99 features for the stdio library, to improve correctness checks in the library, and to fix many conformance bugs and quirks"