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I wouldn't be so sure. I think they can squeeze 2 TH/s out of 1100-1200W.
2000G * 0.7W/GH = 1400W MINIMUM...OK... 
The assumption is that the S4 works with underclocked/undervolted ASICS to reach a better W/GH ratio, I would assume somewhere between 0.55 and 0.65 W/GH, so one 1300/1400W power supply could indeed do. But of course we'll not know for sure till @BITMAIN reveals the exact specs.
Evga 1500w Platinum
and, btw...
5units of S3+ = 355w x 5 = 1,775W
i assume S4 will be around 1500w - 1700w
they wont waste chips like that..
they better selling chips like avalon do than planting so much undervolted chips
and sell it so damn cheap
they're not doing charity here buddy
they "wasted" them like that on the s2....
the s2 chip freq is 192.... the s1 is 350
This is my thought. I don't know if they'll under clock enough to run on the 1050w supplies like before, but 1200w supplies are reasonably common and we'll priced enough that 2th/1.2kw seems like a fair target, and if psu is included it would justify a 2.4btc price tag
I agree I have all my S2's upgraded to 1350W Platinum power supplies and over clocked to 1.11TH so I think with new chips and 1300 Watt power supply close to 2TH is a good target or 1.7TH is acceptable