It sounds random, but Global Equities Research analyst Trip Chowdhry is claiming that Steve Ballmer, Microsoft's CEO, will be joining Apple during their WWDC keynote. It's not completely crazy though - Bill Gates jumped onstage back in 1997 at Macworld.
So what will Ballmer be evangelising about during Apple's big iPhone 4 reveal? Err, Visual Studio 2010, according to Chowdhry, which lets developers create iPhone, iPad and OS X apps on Windows. Apparently seven minutes have been "blocked off" for Ballmer, during Apple's big keynote.