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Well, if they report it as very very good, it frankly won't surprise me all that much. If they report it as very bad, then they are smoking something.
DxO is always a crap shoot...their numbers can give some bit of a reference point, but in other ways they are quite misleading. Their lens reviews are absolutely awful.
Previous testing with DxO software, but not BY DxO (Techradar) has shown the E-M5 to have exceptionally high dynamic range, so my guess is that's what they're looking at.
Tech Radar DR Testing
They measure RAW conversion TIFFs from the OM-D to have better DR than even the X-Pro 1, which would be rather surprising.
Thing is, if they revise it down with some rationalization, but haven't looked nearly as closely at other cameras that are ranked high, what does that say about the viability of comparisons using DxO?