I enabled the wifi network wlan0 according to the several startup descrpitions with "edison_configure --setup". After that I could not connect to the edison board over wlan. I resolved that problem by disabling the usb network connection with "systemctl disable network-gadget-init.service". After rebooting the board ifconfig only shows loopback device and wlan0. Notwork connections ssh and browser port 80 are now possible.
My /etc/version is "edison-rel1-maint-weekly_build_16_2014-10-14_14-56-19".