I heard that somewhere as well. It makes sense, smaller the sensor, smaller the lenses can be and size/weight has been one of the big selling point for EVIL cameras. They could go with APS-C sensor, but as you said, that'll eat into the sales of their DSLR and they won't be able to make the lenses all that much smaller due to sensor size (see NEX series). And there's a snowball's chance in hell they'll get into Four Thirds/MFT system.