One thing I find interesting about the MFT format.

With APS, there was always this feeling of compromise because, it had a frame size that was half the size of 35mm film and yet, it was always in the same exact mount and body configurations.  This very thing has given many people Full Frame envy among other brands.

With the house that Olympus and Panasonic built, you don't have that same issue anymore  as it is more like the camera was built around the sensor format and not the other way around.  I like the security of knowing Olympus and Panasonic aren't just going to randomly change things up on me, and make my lenses completely obsolete by changing the format.  If either company does decide to do that, the other still has bodies that can be used.