The GCC 4.7.2 point release isn't particularly exciting, but does present a number of fixes for users of the 4.7 version of the GNU Compiler Collection. There's over 70 bug-fixes as part of this latest release.
There's also ABI fixes as part of GCC 4.7.2 so there is some incompatibilities for code using C++11 templates. The incompatibility is with GCC 4.7.0/4.7.1 but should restore binary interface compatibility with GCC 4.6 and earlier.
More details on GCC 4.7.2 can be found via the GCC release announcement.