As reported on Mirrorlessrumors Epson started the mass production of their new 4.4 MP electronic viewfinder. While officially not confirmed the new Epson EVF should be used by the Leica SL. It’s highly likely that both Olympus and Panasonic will sue the same EVF on some of their future MFT cameras. Maybe on the E-M1II and GH5?
The new Epson EVF is the highest resolution EVF ever used by a camera. And here is the full spec table posted by Epson Japan: