Serious answer alert...
It'll be someone we've never heard of.
Why?, because no-one can name but a handful of them, and those who can be named are probably only known through infamy rather than excellence.
We'll get a name and scurry off to see what his/her previous clubs fans have to say about them, we'll not be enthused by what we read. Woe and trepidation will overcome the site as undue prominence will be given to what disgruntled fans have to say about previous performance... but it shouldn't.
Why?, because no-one becomes a CEO as a means to become popular. They perform a functional background role that usually, one way or another, will annoy one section of the fanbase or another. Those fans will spout off on an internet message board but in truth the 'contentious' decisions made were probably for the ultimate benefit of the club... and that's who the CEO works for, the club, not the fans.
Like all JB's appointments I am sure the process will be thorough and will result in the best available candidate for Argyle being appointed.