OM-D?

Don't be fooled by the OM name. It is a micro 4/3 camera, so it is no new market for them. Just a model above the E-P3, for the myriad users that wanted a built-in viewfinder body like the NEX-7 and X-PRO1 have.

I agree with Ariel; it's a m43 body.
Some zealots have recently (and longingly) tried to argue that the new camera will be a full-frame digital recreation of the beloved OM-System. But where is the evidence that Olympus would try to release something of the sort? What lenses would they use on the camera? Olympus doesn't have any lenses that cover the image circle of a FF sensor. There is ZERO chance that will happen. And O also won't introduce an OM-styled body to use the 4/3 lenses. There's no market for such a beast. The 4/3 system is pretty much at an end for new, innovative products.
So the new OM-D body will almost certainly be a high-end m43 camera. It all makes sense. Capitalize on the recent success of the m43 system. The Pen bodies have been selling like hotcakes. The Fuji X Pro 1 was the darling of CES...albeit at $1600 plus lens costs. Fuji is going after the Leica wannabes who don't have $10-15k to drop on a body and two lenses. It will be a good camera, but I predict it to be another in the line of niche, high quality Fuji cameras like the XPan or Zeiss Ikon ZM from Cosina. High quality, small production.
Hopefully the OM-D, or whatever it'll be called, will really produce a pro-level body at a modest $1100 price that will grab the m43 market by the horns and run with it. I want the fast AF and in-body EVF for my uses....my E-P1 is a great camera and takes great photos....but holding that body out at arms length as my only option is really getting old.
Skip

The kit lens is going to be the new micro 12-50, so there's no chance, at all, this is going to be anything other than a micro four-thirds camera. Pretty silly speculation as far as I am concerned.

The rumors website is also saying now, the camera is not going to be called OM-D. That's the name of the new series of bodies instead of "Pen". If that's the case, we know not yet what the initial body is going to be named.

Also according to the rumors site, around 1,100 Euros for the combined body+12-50 kit lens, so somewhere between $1,000 and $1,100 for the body only may be close to right.

It is definite that Olympus has filed for "OM-D" as a trademark. It's USPTO application #85507702, dated 3 January 2012. There's a leaked photo (Google "OM-D") that shows a black body with retro-styled geared knobs on top, but you can only see part of the right-hand top of the camera, so it's hard to be sure of anything beyond that.

Mike Johnston at The Online Photographer predicts that the OM-D will be full-frame, but I have to agree with Skip: there's no reason to think that Olympus would move in that direction when their Micro Four Thirds line is doing pretty well for them. They'd have to introduce an entirely new line of lenses. It's not impossible, but it seems highly improbable. I'm expecting a Micro Four Thirds camera that relates to the classic OM SLRs no more than the Digital PENs relates to the classic PEN FT: it will look vaguely similar but won't have the same frame format and won't have any backward compatibility with OM lenses or accessories (though of course you'll be able to mount OM lenses via an adapter, just as you can with any other Micro Four Thirds camera). There's no guarantee it will have a built-in EVF, but it makes sense that it would, as a way to differentiate the OM-D from the Digital PEN line. Beyond that, I think the "rumors" sites are just posting their own daydreams.

This could be very cool.

I'm interested in the "fastest AF in the world," ahem, again:)

4/3 yes, full frame? A full frame sensor would require a whole new lens line, 4/3 lenses simply don't have the image circle to cover it. John

Technically aside, if the coming oly is FF...would it cost only ~1000 euros? Come on, guys...

The article never mentioned full frame, but 3/4. The 16 Mp 3/4 sensor is to my knowledge in some Panasonic cameras. I am concerned about the exellent range of Olympus lenses made obsolete by the m4/3.

There is absolutely zero advantage that a 4/3 mirrorless camera would have. 4/3 and m4/3 use the same sensor, with the difference being the register distance because of the 4/3's mirror box. If the "OM-D" were a 4/3-mount camera, it would still need to have the 38.58mm register distance, so there would be a large empty cavity between the lens and the sensor. This means that you have the size penalty of 4/3, but you also have the autofocus incompatibility of m4/3 cameras (the reason that 4/3 lenses don't autofocus well on m4/3 cameras is because Olympus mirrorless cameras use contrast detect autofocus, but the 4/3 SLR lenses are optimized for phase detect). An OM-D would be COMPLETELY unreasonable to produce as a 4/3 mount. It would be no different than just using an E-P3 with the 4/3 lens adapter. It can't be anything other than m4/3. Its only saving grace is that Olympus FINALLY listened to the market and is putting a viewfinder built in to the body. First to the party, last to the store shelves though. It will stem the number of people leaving m4/3 for the NEX7 and Fuji mirrorless, but it's too late to get the jump on their competitors. Olympus' 4/3 lenses are already obsolete. The only way to make them work again is if Olympus is able to develop an on-sensor phase detect autofocus such as the Nikon 1 system has.