I got an e-mail from Reiner stating what would be improved in mod 2. I'm pasting that below. He also wrote that there will be a chance to upgrade existing bodies for a fee.
The new HY 6 mod.2 will be completely in black. (Note - this is only for new cameras. Upgrades to existing camera bodies will not include replacing the colored body parts.)
The new camera includes the following :
Innovation 2012 – Hardware
Modifications of the handhold detent for better handling
Reinforcement of the handholds adaption, to guarantee the maximized protection for the housing
In cases of dropping or collision
Stand plate revised for protecting the autofocus module from damage
Innovation 2012 – Firmware
The objective lens register for the AF-Offset has been remarkably extended
The possibility to individually save the AF-Offset of the registered objectives
Best possible control of the battery capacity through a symbol in the operation center on the viewfinder display or in percentage shown on the handhold display
Fault management improvement