Yep, very impressive idle consumption if true.
I do wonder if that is just 3W when idle using software to use an IGP instead, or maybe they've added the ability to basically use one CU, turn off all but one memory chip and run the bus at 1x, even then 3W is a push.
Could also just be one of AMD's "lets see whose leaking info" slides
A for prices, I wouldn't go with pre-order prices, the first 1-2 to appear are normally exclusively ridiculous and as Gibbo said, pricing is likely still undetermined.
It's not an unknown tactic for ANY new production launch from anyone to leak higher prices both so the direct competition doesn't pre-emptively drop their prices first but also importantly to not kill sales of the existing stock.
If AMD announced today that their upcoming card was 80% faster, would cost £200 and would be available on Jan 9th....... how many £200 6950's would they sell from now to Jan 9th.... answer, none. How many 6950's that whichever store it is that has a 7970 listed at £500, would sell if that pre-order was listed at £300, few to none.
There are tactics in leaks in pricing pre-launch, mostly in an effort for a company to not shoot itself in the foot.
AMD, Nvidia, Intel, doesn't matter who it is, up till you launch your most important goal is selling as much of the old stock as possible, at as high a price as possible because its going to drop in value significantly right after a new launch.
Anyway, one of the more interesting things it looks like considering this gen is, if a 3gb 7970 is £380 and a 1.5gb 7970(if there is one) is £320, which would you buy? I'd probably go bigger if I was using eyefinity, but keeping in mind AMD in almost every single game runs out of memory WAY after Nvidia does with seemingly hugely better texture compression, I'd happily take 1.5gb for a 1080p screen.
More likely that we'll see 7950's with two different memory amounts, however IF it has a cut down bus, it might be more along the lines of 2gb/1gb options, or maybe 2.5/1.25gb options, I wouldn't drop to a 1gb card, 1.25gb is probably pushing it, 1.5gb likely has plenty of headroom for 1080p for a couple years.
With supposedly 7950's appearing quickly with custom coolers, I'd think lower memory versions will also be available on or near launch unlike the 1gb 6950 coming a bit later.