What will be the first major Nokia device look like following Microsoft's acquisition of its smartphone arm? We'll find out tomorrow, according to a cryptic tweet featuring a mysterious black box from the company. That's when Nokia's head of product business, Sebastian Nystrom, will host a session entirely focused on "what's next" for Nokia at the Slush conference in Finland. A shiny new flagship phone is likely out of the question, which leaves us wondering what else Nokia could have up its sleeves.