Source: Brandon Griggs / CNN Three months after surprising observers by stepping onstage to introduce the iPad 2, the Apple CEO will headline the keynote at the company's annual developers' conference Monday. Jobs will join a team of executives in unveiling Apple's next generation of software, including iCloud, Apple's upcoming cloud services offering, the company said. Jobs was diagnosed with pancreatic cancer in 2003 and had a liver transplant in 2009. In January, he took an indefinite medical leave "so [...]