Nokia (NOK +4.5%) catches a 2-notch upgrade to Buy from Denmark's Danske Bank, and responds accordingly. The firm cites growing optimism about Nokia's debt-raising and turnaround abilities, and the improving performance of Nokia Siemens. Meanwhile, a teaser ad for an upcoming Lumia phone shows a device with an aluminum body and large lens. Is it the Catwalk phone, or a Lumia with a 41MP PureView sensor? Either way, odds are it'll be unveiled at tomorrow's London event.