The rumor sites seem to be talking about a single body that will take both full 4/3 lenses and m4/3 lenses without an adapter. (I can't quite figure that out, myself.)
Nor can I: it seems based on wishful thinking rather than evidence.
The general consensus is that the "pro" OM-D coming in the fall will be able to use the old 4/3 lenses without a focusing speed it, that may mean on-sensor PDAF. We'll see.
This part is better supported by actual statements from Olympus about a future body that will properly support the high grade Four Thirds SLR lenses. With Sony and Olympus having publicly said that they are collaborating on photographic gear as well as medical devices, on-sensor PDAF seems a reasonable hope.