According to industry sources, AMD pushed launch of its next-generation Radeon HD 8000 "
Sea Islands" family of GPUs to the second quarter of 2013 (April-June). The delay comes in the wake of the company going through reorganization within its ranks, in response to poor market performance in Q3-2012. The company originally planned to launch its GPUs before the end of 2012. NVIDIA plans to launch a refreshed lineup of Kepler GPUs in 2013.
Source: DigiTimes