3GWeek Rumor: Sony Ericsson new line ups
Sony Ericsson is rumored to create competitor for iPhone. The phone, codenamed Maria, will focus on media features with solid user interface. There might be another mid-to-low end smartphone that will assign as P600. This maybe a M600 with 2 megapixels camera. A next one will be ultra high-end smartphone, named P3i, but this will not be its final product name. It will run under new UIQ Operating System, not UIQ 3.0, and will compete with Nokia N95 and E90.
Source: SEFanatics
but that how I think.