Is Nikon preparing to launch a 25MP D3 successor?

Will the rumoured D3X use Sony's 24.4MP full-frame sensor?

Following on from rumours earlier in the week that Samsung is working on a full-frame DSLR, come whisperings that Nikon could be preparing the way to launch a more powerful version of its flagship D3 model.

According to Engadget, the rumours began circulating after hackers levered open Nikon’s latest D3 firmware update and discovered a number of references to a new D3x model within the update code.