Since this was an online leak of information, there are no exact details about the price or availability date, but some of the specifications are known, like the K660i being On the other hand there is the Sony Ericsson W890i, which is an upgrade of the W880i. The improvements include HSDPA, a 3.2-megapixel camera, and better software for the Walkman music player. 
Sony Ericsson is suppose to launch a couple of new mobile phones later today, more specifically the K660i and W890i which are Walkman phones, and also the W380i.
able to support HSDPA, quad-band GSM, and EDGE. Much like the iPhone, the Sony Ericsson K660i will display the web browsing sessions in landscape mode, making life easier for the users. Other features include a 2-megapixel camera and (FM) radio.
Sony Ericsson to launch new phones today? K660i, W890i and W380i
Original source here