> but I don't understand why they believe this could be "blessed" by inclusion into the repository.

Google is, of course, a big company with lots of very smart people, and they rely on Python (and probably want to rely on it more in the future). Given that they employ Guido and also the primary developers of Unladen, the chances are very good that they will continue to vigorously improve upon it until their performance goals are met.

As far as introducing C++ goes, it's going to stay roped off in LLVM land (see [the PEP](http://python.org/dev/peps/pep-3146/) for details).

As far as community support, LLVM has plenty of that.