After reboot my Devstation returns to DHCP. I tried setting the static address in the Networkconnections GUI and also the thinstation.conf.user text file. It also happened in the previous version and there for made a workaround with a reservation on the DHCP server. For this test setup i like to make use of a static address.
Im using VMware Workstation 12 but also tried ESX 6.
Maybe someone can point me in the right direction :-)