You guys are being trolled pretty hard here.
In any case, I wouldn't expect miracles from from GK104, TSMCs 28nm process is not very good right now. AMD has historically been better at moving to new nodes than nVidia and AMD did a great job with Tahiti, reasonable power consumption and heat together with some nice OC headroom.
I expect GK104 to come under 7950 performance and if its going to use 225W (and we all know we can trust nvidia TDP claims) it going to use a similar amount of power.
Now pricing could be interesting, if it is priced at 299 and gives slightly lower than GTX580 performance than they have a real winner, but we have 570s that cost that much so it won't be unprecedented.
Whats more realistic is nVidia just pricing where there is a gap for it. If the 7950 is 449, then GK104 will likely be 399. and might beat the 7870.