It's a pointless card and the power it would suck(at clock levels that make it worthwhile) mean it would break most agreed upon design specs meaning basically no sensible PC maker will stick them in, nor will AMD create them in large quantity, nor is demand high. Basically they are pointless, as bad as the 590/690gtx/5970, etc, etc.
The 3870x2, around launch, better price than two separate cards, worked well, didn't use obscene power and wasn't particularly loud, yay. The 4870x2, awesome, it had 1gb per core before the 1gb single cards were out, it cost LESS than 2x 4870 512gb cards, and it was out within around a month of the single cards. IE it was good value for money AND offered more performance at higher res than anything else on the market plus awesome performance of two 4870 gpu's. That was a freaking awesome card, loud as hell with the stock fan, all but silent with the shroud removed and a 120mm fan strapped on to the side zip tie job, £5 fan, silent awesome performance.
The 5970/295gtx(is that what it was called, I honestly can't remember) 690gtx/6990
.... all sucked, or blew(particularly nvidia ones

).
They offered less value for money, didn't come out that close to the cards launch(the 5970 was the closest by a mile the rest were so late they were pointless), they were pushing the 300W(and, errm, 500W overclocked or properly used) barriers, they were loud as hell under full load.
4870x2, when you can buy a better card for less money than two separate and its not so loud you want to cut your own throat so you don't have to hear it during games, awesome. When they got loud, cost more than two separate and were so "late" to the market you'd only get a few months before the next set of cards are out, or more importantly you could have had 2 full speed, quieter, better overclocking, safer cards for 6 months already.... they lose any value at all.
Dual GPU cards died this gen.... AMD and Nvidia are making sure of it, clearly the cost/volume/safety/reliability of the cards are terrible, if they turned a profit they'd be out, and quickly after launch, they are now epeen cards, one or both companies might encourage a partner to shove one out the door but they don't actually care about them anymore.