RIM's rumored BlackBerry 9900 and WebKit-based browser gained corroborating evidence today with a research note from Kaufman Bros. analyst Shaw Wu. He points to contacts in the industry and parts suppliers who say the touchscreen slider phone is in development and resembles a cross between the Storm2 and one of RIM's non-touch QWERTY devices. It's currently in the prototype stage and is likely to ship sometime in 2010.