According to foreign media reports on April 25 Beijing time, Nokia plans to hold a press conference in London on May 14th to introduce the strategic direction of its Lumia series of Windows Phone smartphones.The company sent out invitations to journalists on Thursday, revealing some details.In the green background of the invitation, the words "See What's Next" (see what happens next) are barely visible, alongside Nokia's promise: "The Nokia Lumia story continues" (the story of Nokia Lumia will continue).Nokia has bet its future in smartphones on Windows Phone and its Lumia series. The phone has received widespread praise, but Microsoft's operating system overall has not met the expectations of either Nokia or Microsoft.This busy period chosen by the Finnish mobile phone manufacturer coincides with Google's I/O Conference and the BlackBerry World Conference.