It was only a matter of time before AMD released their new series of GPUs. The 8000 series, codenamed "Sea Islands" (What is it with strange codenames?) are rumoured to be built with TSMC 28nm manufacturing technology which is also used on the 7000 series but the new GPUs will have around a 40% performance increase over the current generation thanks to an 18% increase in transistor count (among other things). Sea Islands contain 5.1 billion transistors versus the 4.3 billion on the 7000 series.
Sea Islands GPUs are rumored to have 2560 stream processors, 160 texture units (TMUs), 32 or 48 ROP units (ROPs) and 384-bit wide memory interface.
I am really looking forward to seeing how these perform.