Investors grew more optimistic about a February launch of Research in Motion’s much-delayed BlackBerry 10 smartphones. RIM will release the latest version ‘‘not too long’’ after a Jan. 30 launch event, chief operating officer Kristian Tear has said. The new phones are seen as critical to RIM’s survival as it struggles to hold on to customers who are abandoning BlackBerrys for iPhones and Android phones. The Canadian company seems to be preparing for a February global launch, a month earlier than many analysts were expecting. The new BlackBerry 10 system is designed for the touchscreen, Internet browsing, and apps experience that customers now expect. Its current software is still focused on e-mail and messaging and is less user-friendly, agile, and robust than iPhone or Android.