They probably want to clear out 4870X2s first. Not only that, but the 4870X2 is already a heat monster, so a 4890 X2 would just be a more overclocked version that generates even more heat. We'll see what happens soon enough.
Yes that's a well known fail card...oh wait no it isn't!
You have no clue. You should actually read about hardware instead of just looking and waiting for charts.
The 4850X2 is a disaster, its a nightmare. You have a 50/50 chance of actually getting drivers to stick, let alone having the card work right. Not to mention its physically larger than a 4870X2. The card fails in every way.
The 4850X2 is junk. I win, you all lose. Really. Buy a 4870X2 instead or just two 4850s.