AMD has launched their M400 series for laptops. However the parts that have been launched are not based on new FinFET silicon, but rather re-brands of existing 28nm parts. At the head of the new launch is the R9 M485X, which is reportedly based on AMD’s Tonga graphics processor. This is apparently a more powerful chip than AMD’s upcoming Polaris 11. It is expected that Polaris 10 will slot in above the M485X, in the M490 series.
AMD quietly released re-branded mobile GPUs in advance of Computex
The following is a list straight from AMD’s site of all the new mobile GPUs that will be available.

M465X is expected to based on the Cape Verde chip, whereas M465, M460 and M445 use the ‘Topaz’ silicon
AMD’s Polaris architecture is expected to be revealed soon, in both the Desktop and Mobility product lines. The release of re-badged parts for the M400 series is likely just to satisfy OEMs, as the new FinFET silicon isn’t quite ready for launch. Polaris-based mobility parts will likely slot in around the parts launched today in the coming months. Bringing with it a massive leap in performance per watt and overall power efficiency that is incredibly important in the mobile environment.