A site by the dubious name of SemiAccurate has posted a picture of a new dual-Barts graphics card from PowerColor. The Barts GPU is used on the HD 6850 and HD 6870 so people are speculating that this card will be a dual GPU HD 6870 that might be named the HD 6890. If this card is PowerColor only product, they could follow in Asus' footsteps and give the card its own special name. If each Barts GPU has the full complement of stream processors and memory, then this card will have 2,240 stream procs and 2GB of GDDR5.
More information about this product should be announced during Computex in June.