Sadly, but not surprisingly, Banfield, The Pet Hospital, saw a 30% increase in cases of kidney failure from early December through early March, while the Veterinary Information Network estimates 5,000–10,000 pets have gotten sick and 1,000–2,000 have died.
Petconnection.com has 3,730 deaths reported by pet owners as of March 10th—these are self-reported and is not considered an official total yet.
You can find out much more on the recall on my Pet Food Recall Archive Page.