I think this are regular out-of-camera jpegs. I like the dead-tree and the mysterious-water-and-architecture shot as images, but from these images you can't really figure out performance. "Impress shots" on the web are generally heavily post-processed products, so you can't figure out any performance from them either, what you need is raw files and we'll have to wait for that.
Meanwhile I don't think it really matters what images the manufacturer would release... people see what they want to see.
I think 7D2 was a large upgrade from the 7D in terms of sensor performance, it has no banding noise for example which is a big thing for Canon, if we get 7D2 pixel performance I think the 5DS will be okay, although forum folks would have preferred DR in class with Sony CMOS of course. Concerning color rendition we'll have to wait and see. For typical studio work the DR will of course not be an issue, hasn't been for a long time.
There are still many photographers out there that don't worry that much about having the best DxOmark numbers or think much about the elusive MFD or CCD look or whatever, and for those I think this camera will provide a new interesting mix of high resolution, speed and flexibility. Maybe architecture photographer Iwan Baan will consider swapping out his 1DX for this one...