Viens de trouver ça chez dpreview (je sais, c'est vieux d'une semaine, mais quand-même):

"I heard from Canon that they offically stopped production of the 30D. They are gearing up for the "40D". Will be in stores by Q4.
They will also be winding down the 5D production over the next couple of months. "

Heard from Canon - 30 D replacement: Canon EOS 30D/20D/10D/D60/D30 Forum: Digital Photography Review

Suis méfiant... tant que je ne vois rien de concret sur un site Canon...