Apparently the foods that are affected are mainly "chunks and gravy"-type foods, which are difficult to produce. Companies like Iams, etc contract the manufacturing of these products out to Menu. Wheat gluten is an ingredient in the "gravy", and the timing of deaths coincides with a change in wheat gluten suppliers.
Many reports have stated that there have been 10 deaths, but that is 10 deaths out of 50 animals involved in a feeding trial... a 20% mortality rate. Very scary. The deaths look much like antifreeze or lily toxicosis, with animals dying of acute renal failure.