I'd agree I would expect a micro 4/3 mount not the original OM one.
The OM models were damn good cameras but sadly Olympus never again reached that level of respect.
Personally I think the abandoned normal 4/3 (which I predicted years back and unlike a few folks never backed down on that!) format is the second time Olympus has dumped on their users, yes the adaptor is fine but Oly are out of the DSLR business in all but the E-5 as a token last gesture to Oly fans. To me it was obvious from day 1 that 4/3 would not be able to compete effectively with APS-C in the DSLR game, and that was proved beyond doubt.
Folks would be right in thinking Sony are not on my Christmas card list, but...Olympus is a make I would never entertain in any way shape or form, even less so after their corporate scandal and rather sad attempt at dealing with it (ie getting shot of the "honest" CEO)