Because Pana invited Oly Engineers to participate in the engineering process.
There is speculation, that there will be OIS built into the DSLR, and your lens selected will be from the exisiting Oly range of Zuiko digital lenses, as well as news from other makers, like Kodak, Sigma etc... all the big co involved in the Four-Thirds agreement.
There is however a rather big downside i feel about the 2x cropping factor.
Meaning with your 18-70, it becomes 36-140 field of view... rather a bugger to me. U need stuff like 7mm lens to get true wide angle... wah kau.. that will surely ensure a freaking expensive range of lens to have.
of course they won't mention anything about it. if they say it it coming soon, who in the know want to buy the FZ20? everyone will be waiting and they will be stuck with excess stocks. I do think that the so called FZ30 is inevitable, just a matter when it is coming out.