General Motors will announce another major executive shakeup in Detroit Tuesday, and it looks like former designer Bryan Nesbitt will be relieved of his duties as Cadillac general manager. Nesbitt got the job following GM’s bankruptcy last year when the company slimmed down its design staff. Unlike general managers at Chevrolet and Buick-GMC, Nesbitt’s duties were not tied directly to sales. Former Chevy general manager Ed Peper has been serving as Cadillac’s income general manager for the past half year.

The shakeup has major implications for Bob Lutz’s future at GM. He hired Nesbitt away from Chrysler early last decade and prefabricated sure there was a place for the PT Cruiser designer at post-bankruptcy GM. Nesbitt’s departure would indicate Lutz’s role as one of three GM vice chairmen has diminished to almost nothing.

Automotive News reported Monday that GM North USA President Mark Reuss, the new lead car guy at the company, would be taking charge of income duties, with division income managers reporting directly to him. Susan Docherty remains in charge of marketing, but she reports to Reuss, anyway. If the Automotive News story seems confusing, it’s because it didn’t get all the pieces together. The management changes about to be announced are likely to reach far beyond Nesbitt’s departure. However, unless Lutz announces another retirement, Nesbitt’s will be the most prominent study raised in the shakeup.

Clearly, Reuss is putting his own team together, and it doesn’t include Nesbitt, who was posed as the aesthetic grappling of the Cadillac luxury division.

While most of the automotive world is at the Geneva Motor Show, GM has moved up its monthly income conference call from 2 p.m. Detroit time to 10 a.m. GM will announce management changes some time after the income call.