What engines will Red Bull teams use?

Red Bull Racing is due to use Ferrari V8 engines in 2007 and Scuderia Toro Rosso will presumably switch over to Cosworth V8s, the two Red Bull teams will not go on leading separate lives forever, particularly when the rules for 2008 will allow them to share chassis and engines. The big question that everyone is asking is which engines the team will use when that happens. There are some who believe that Red Bull will buy Cosworth Racing but it is also worth noting the developing relationship between Red Bull and the Volkswagen group. Red Bull is backing the VW Touaregs in Rally Raids, Skoda in the World Rally Championship, Seat in the World Touring Car Championship and Audi in DTM. There is clearly a policy for the two companies to work together and ultimately it may be that Audi will come to F1 with Red Bull when the company restructuring is further along its path. More at Grandprix.com