If you plan on using this body for shooting events in MRAW/SRAW and 1.6x crop when reach is needed to speed up your workflow (with the option to still use full resolution for low shutter count outings), those hopes look to be dashed.
The ONLY reason this camera was even on my radar was because of this possibility. I would practically never
need 50MP, BUT the crop modes caught my attention. The thought of possibly "consolidating" crop and FF into one body for both needs did cross my mind there. Say, shooting an event in mRAW format and then boom, 1.6x crop mode for extra reach (when needed). Then the 7D could be left at home...or with stellar implementation, even sold(!).
Major disappointment, if true. No extra buffer capacity, either. Oh well, nice thought though. Seems like a VERY specialist camera indeed. The implementation of the crop modes was all I was interested in - if I still have to deal with gigantic 60MB/50MP files, it defeats the purpose.
Still, this camera will likely make a lot of folks happy. But doesn't seem like it's for me. Let's see what the 5D4 brings.