Kingpingcooling forum user Shammy has published some photos of an upcoming 1200W semi-modular power supply from Antec, which is possibly named Antec True Power 1200 Quattro OC Edition.
This model features two knobs on the back, one to adjust the fan speed and another one to adjust the +12V rail to up to 12.4V. It has six +12V rails that can handle up to 38A each, with peak output said to be 50A, capacitors to improve output, and there are a total of 12 PCI Express power connectors.
12x 6pin pcie connectors (via 6 REAL Lines) at 2200UFx6 - 13,200UF at connector end - All the solid caps on MB/VGA has only 300+UF max per cap for 16v rated due to only non-solid caps can go high capacitance.
so 4 x 285 classifieds or 4 x 5870s (soldering on an additional connector per card if you are boosting your input)
or 6x 6 pin pcie connectors + 6x 8pin pcie connectors (via 6 REAL Lines)