As you see from the graph above (Source: Itmedia.jp) five of the TOP 10 most sold system cameras are mirrorless. The data do referr to the last week sales in Japan.
Ricoh announced a new firmware for the GXR system camera. You can download it here: ftp://download.ricohpmmc.com/DC/. The firmware adds new AF and AE tracking systems, along with new scene modes (via Amateur Photographer).