I'm pretty sure if Olympus can garner a high res sensor they'll use it (more so to the delight of marketing folks than engineers)
The rumored upcoming 20MP sensor from Sony may be the next candidate
It's a question of user's perception and not necessarily need that the higher resolution the better the result
There are many other factors which come into play when one ups the ante on resolution
As a refresher read this article from Thom
http://www.bythom.com/printsizes.htm
I, for one, may not need a higher res camera but I'm afraid at the rate every manufacturer is trying to distance themselves from the competition by relying on sensor resolution and 4K video, I may end up with one should I buy a new camera whether I need it or not