The photographer is, in fact, a legend amongst rock photographers - Neil "Zloz" Zlozower. The photo itself was taken at John's home (you can see the blue backdrop in a corner on other photos) sometime in the first half of 2006.
This photo appears on cover of two magazines...
Guitar Player (USA), November 2006
More photos from this magazine (soon to be re-scanned and twice as big):
http://invisible-mov...11guitarplayer/
Guitar Magazine (Japan), May 2007
(more pics from the same magazine here:
http://invisible-mov...armagazinejapan)
It was also given out as a poster with the Total Guitar (UK), December 2006 issue, but only in ASDA, the store chain in UK. Perhaps you can save a search on eBay and look for that poster. I attached a photo of it to this post.
P.S. Since you're new to the site and the forum (saw your comment on the most recent news item), you might not be aware of 200+ magazines in the magazine scans' archive, so I thought I'd point you there:
http://invisible-mov...et/v/magazines/