Apple’s Chief Executive Steve Jobs, who spent months on medical leave, will open an annual developers’ conference on June 6 showcasing the iPad maker’s latest computer software and a new cloud computing service. But it’s unclear if he’s returning from medical leave or simply kicking off the conference.

Jobs and his team plan to unveil a new cloud-based service called iCloud, which will offer remote computing and data over the Internet, and a slew of software upgrades at the conference including Lion, its Mac OS X computer operating system, and iOS 5, the next version of its mobile operating system.

Nokia abandoned hope of meeting key targets just weeks after setting them, raising questions over whether its new boss can deliver on the turnaround he promised in February.  The news sent its shares tumbling 18 percent to their lowest in 13 years, wiping some $5.5 billion off its market value. Investors are worried the company, once the leading force in its industry, is losing so much market share it may never regain its footing.

World Health Organization (WHO) cancer experts say using a cell phone may increase the risk of developing certain types of brain tumor and consumers should consider ways of reducing their exposure. A working group of 31 scientists from 14 countries meeting at the WHO’s International Agency for Research on Cancer (IARC) say a review of all the available scientific evidence suggested cell phone use should be classified as “possibly carcinogenic.” The WHO had previously said there was no established evidence for a link between cell phone use and cancer.

And for a sneak peak of the Cr-48 laptop, the first implementation of Google’s cloud-based Chrome operating system, give Steve Levy’s piece in Wired a read. Levy’s not quite sure we’re ready for a “cloud”-based future. See what you think.