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Well, that was what 43 Rumors had reported, more than once. You are supposed to take it with a grain of salt. If you don't think they have an ounce of credibility you don't have to believe it. All I am suggesting, to anyone who is considering the Panasonic 12-35 lens, is to wait for a month when the Olympus 12-35 lens is supposed to be announced. Again, this is coming from 43 Rumors and you can reject that piece of information if you choose to. We know that the Panasonic 12-35 is a good but not incredible lens. If anyone can better that lens it would be Olympus, as they have a long history of making excellent optics.
Really, the rumored lens is better? And we know this how? Heck, we don't even know what the focal length of the f/2.8 standard zoom from Olympus will be, let alone what its optical characteristics are.
As to the 12-35 on the OM-D, it performs well, but it's not super awesome for landscape use. It'll do fine, but it has some field curvature that renders the edges a bit soft at infinity.