I'd happily take a prototype 7D II to the Olympics...hell, I'd be ecstatic. I wouldn't want to take a preliminary test model 7D II to...well, anything.
Only if it were to be used for fun shots, or unimportant games that you aren't being paid to cover. Why? Simply because as a sport's journalist covering such important event you would want the best body for the job, and that would be a 1D X.
I am looking forward to the 7D Mark II but it will not be as good as the 1D X, it will give more reach, be useful in that regard but I would very much doubt it would be better than the 1D X.