From the AP:

A person with knowledge of the deal says Ben Wallace is coming back to the Detroit Pistons.

Wallace will receive a $1.3 million, one-year deal, said the person, who spoke on the condition of anonymity because the contract has not been signed. Wallace is expected to do that early next week.

[...] Wallace will be a familiar face for a team in the midst of big changes. He will recognize former Cavaliers assistant John Kuester, who last month became Detroit's sixth head coach in the past 10 years.

Of course, Wallace recognized Kuester when he arrived in Cleveland from Kuester's time on Larry Brown's bench in 2004, but that's neither here nor there.

Welcome back, Big Ben!