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At least some mirrors have the tarball:

ftp://ftp.mirrorservice.org/sites/sourceware.org/pub/gcc/releases/gcc-4.8.0/

ftp://gcc.gnu.org/pub/gcc/releases/gcc-4.8.0/

Someone on HN must really want gcc 4.8 to be released ;-)

http://gcc.gnu.org/gcc-4.8/ has now been modified to say

March 22, 2013

The GNU project and the GCC developers are pleased to announce the release of GCC 4.8.0.

Agreed :) This one has them ftp://gd.tuwien.ac.at/gnu/gcc/releases/gcc-4.8.0/