Olympus will NEVER introduce a 35mm-size frame digital camera with OM mount.
First off, they have staked out their position with 4/3 and m4/3 spec cameras. That was (and is) a huge investment for them, and they cannot afford another investment of similar magnitude. While the entire company, which comprises their medical imaging, systems and other non-camera areas are substantial, they are still a relatively small company. The camera division is its own P&L centre, so unless the board is willing to see that division take a loss for a long time, it will not happen.
Second, they have stated that legacy OM system lenses are NOT adequate for current digital capture technologies. Unless they were willing to partner with Kodak or some other partner to develop or adapt the M9 type sensor to an OM body (again, a relatively huge investment,) they would not risk the bad reviews coming from legacy glass on an OM-D.
In addition, they would open the door to Zeiss and others producing 3rd party glass for such a system, which would eat into potential profits from the sale of any new digital-specific lenses developed for such a system. Zeiss, in particular, already has the glass ready; converting the mount to OM would be fairly trivial. With most of their R&D costs already sunk, Zeiss would be able to compete even if new OM-D lenses were priced 10-25% lower. Who wouldn't be willing to spend a small premium for Zeiss glass on an OM?
No, a "full-frame" OM-D will never see the light of day. It is highly, highly unlikely that even Maitani-san memorial film OMs would be even considered, though the appeal to his memory would likely be the only chance for that happening.
I don't mean this as a downer, cuz I'm pretty sure everyone realizes this already and that the dreams mentioned are dreams that further enhance our fondness for the OM system. Thank goodness we have folks like John Hermanson to keep our OMs ticking.
Chop wood. Carry water.