Just out of curiosity, I know the 5000 series is supposed to launch in a few weeks, what was the time frame of the 4870x2 and the 3870x2 in comparison to the respected single card releases? Did they release at the same time, a few months behind maybe??
Release date for both was about 2 months (-/+ a few weeks) after their single VPU counterparts.
A good place to look for release dates most the time is the wiki at least that's what I have been using lately