Firing Squad writes: "The not so secret Radeon HD 4870 X2
Normally companies like to keep their upcoming plans pretty quiet. After all, you don't want to tip off your competitor(s) about your future products. Divulging these details could also affect sales of your existing products.
Apparently someone forgot to pass that tip along to ATI – the company has made no secret of their graphics plans for this generation, particularly at the high-end of the market, where the development of the Radeon HD 4870 X2 was openly acknowledged before, during, and after the Radeon 4850 and 4870 launch."