A somewhat reliable, industry connected source (Joe Wisniewski) indicates that this new Sony "HD" sensor will do full binning in both directions on-chip for downsampling to video resolution, so using all photosites, not every third line as with all DSLR video modes so far.
(And that Nikon is field testing prototype bodies with this feature.)
If so, it should deliver better than any DSLR so far on the low-light performance promise of "affordable big sensor video", and have less aliasing issues.