According to the latest rumors AMD's ATI RV870 flagship graphics card launch is almost imminent (somewhere next month)
At an Asian bulletin board, is seems that the RV870 surfaced with specs and all, it supposedly comes with a 384 Bit memory interface, but that info seems shady and somewhat inaccurate, we'll leave that info as is.
Other colleagues published a 3DMark Vantage scores in the performance preset for the mainstream solution RV840 (Juniper) already a few days ago. That chip reached a P9500 points, while they did not give any further details about the test system. But this causes a ranking between HD 4850 and HD 4870.
That same source has also a result of the flagship product RV870 (Cypress) on hand. But they did not disclose exact performance number, but a range in-between P16000 and P18000, which is almost twice the RV840 and passing the HD 4870 X2.
Though 3Dmark says very little, it's safe to assume that the new flagship card will performance double opposed to the last generation.