Looks as if the PSP Go has just… stopped. According to a Japanese blogger working for an official Sony retail partner, production of the PSP Go handheld has come to a full stop. Adding some weight to this rumor, the Sony Style Japan online store no longer lists the portable and it doesn’t come up in searches.
The product page only comes up via a direct link, but shows it as out of stock. Sony says that demand for “current generation PSPs” will continue to be met, so we are left with what we already knew, that there is no demand for the PSP Go.