Well this cat survived it's curiosity, everything works as advertised, APPs can be closed like any desktop one, when minimized they go to taskbar and could be closed or maximized from there. Desktop applications are listed grouped first but only in "All Apps", in Metro, normal view stayed as was set previously. My taskbar is set to autohide and shows up just like on desktop applications. Everything is transferable between the monitors and Metro APP can work on one monitor without affecting desktop app on the other.
Only thing is that it's showing 6.3.9600.17031 (Win8.1 RTM), hope it will not be problem when officially released.