Update #2: According to IndustryGamers.com, a Sony Computer Entertainment America spokesperson confirmed on the phone today that production is indeed continuing for the PSPgo in North America.
Update: It's now official, as reported by Phileweb (via IGN) and AV Watch (via Kotaku) to quote: "New PSPgo units would no longer be manufactured or shipped 'in order to concentrate on the NGP'. The remaining PSPgo stock, however, will continued to be sold until it's gone."
Today Andriasang.com (linked above) reports that according to a Japanese Blog Sony has ceased production of the PSPgo handheld with their Sony Style page now showing the PSPgo as discontinued.
To quote: "A blog that appears to be run by a Sony Shop employee (or at the very least a super hardcore Sony fanatic) reports that Sony has confirmed to his sales manager that production on the troubled portable system is indeed ceasing.
The blogger's shop won't be getting any more shipments.
This talk of PSP go's production end apparently began recently when a link to the PSP go was removed from the Sony Store games page. You can still access the Sony Store PSP go product listing, although you can't actually order the system because there's no stock and no forecast for when stock will arrive."
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