Initially planned to be released in November, their launched was postponed due to the success of the desktop Radeon HD 5xx0, so the new Mobile Radeon should be unveiled in January 2010 during the CES.
There are not so many information about those products, except that they will be engraved at 40 nm and should drain less power than the current model. If we align improvement an features to their grand brother dedicated to desktop computers, those new mobile Radeon HD should have a efficient power saving capacity in 2D while seeing their performance in 3D strongly improved. More details to come on January 7th.