The proposed replacement is the 12V-2x6 connector, which is slated to be incorporated into the forthcoming ATX 3.1 and PCI Express 6.0 specifications.

As reported by Igor's Lab, an engineering draft change notice from PCI-SIG points towards an impending replacement of the 12VHPWR connector, a topic of previous dispute. 

The design alterations to the new connector appear to be predominantly mechanical, including modifications such as the recessing of sense pins, aimed at ensuring a reliable contact prior to escalating power demands from the GPU. Encouragingly, the draft specification denotes that the 12V-2x6 connector will maintain backward compatibility with existing 12VHPWR connectors.

The proposed design introduces new power modes for sense pin detection. In addition to the established 450 and 600 Watt modes, the 12V-2x6 connector will feature 150 and 300 Watt modes. Although each pin is specified to accommodate a minimum of 9.2 Amps, the draft makes reference to two distinct classifications, H+ and H++, with no further elucidation regarding their distinctions.

In a move towards resolving earlier challenges associated with 12VHPWR implementations, PCI-SIG has implemented more stringent standards for cable design and quality. Further insights into the 12V-2x6 connector specification will be disclosed upon PCI-SIG's finalization of the draft. 

PCI-SIG Prepares to Replace Controversial 12VHPWR Connector with 12V-2x6 Connector