NEW YORK/SAN FRANCISCO (Reuters) - Apple Inc Chief Executive Steve Jobs, who spent months on medical leave, will open an annual developers' conference next week showcasing the iPad maker's latest computer software and a new cloud computing service.

Apple's shares rose almost 2 percent after it said on Tuesday that Jobs, along with a team of executives, will deliver the keynote speech at the June 6 conference. It was unclear if the CEO is returning from medical leave, however.

An appearance by Jobs, a survivor of a rare form of pancreatic cancer, would mark one of the few occasions he has showed up in public on the company's behalf since going on medical leave -- for an undisclosed condition -- in January.

In March, a thin but energetic Jobs took to his now-familiar platform at San Francisco's Yerba Buena Center to unveil the iPad 2, drawing a standing ovation after months of frenetic media and investor speculation about his health.