I don't think the 50 f1.2 will be so good on it but certainly ok, but the rest you have listed will be, and in particular the newly released 24-70L II, which far (relatively) exceeds the resolution of the 24 TS-E II, and of course others in its range.I think the 24 TS-E II will work very well with this camera - it was startlingly sharp when used on a Hartblei HCam with P45+. OK, pixel pitches are not close to this rumoured camera, but I suspect more MPixels won't be wasted. And 50 F1.2, 85 F1.2, 70-200II, 24-70II etc. will be good too.
Rumors certainly suggest a newly developed sensor which is superior to the 50MP sensor they have displayed previously and targets at performing at higher ISOs. Certainly news I welcome. Gapless photosites on the 1DX have shown it is able to retain the details going up in ISO, to retain a tighter image than even the 5DMark3, however, resolution is resolution. I won't say the the 1DX makes up for the difference in resolution with the 5D3, but it does something a little bit different which I do like, but the increase of 46MP over the 36MP from the D800, I will be interested to see how this translate especially when we are further shrinking the pixel pitch.