The main new feature in this firmware is the use of libevent and rewriting the measurement code to use it. This provides a much higher capacity for doing measurements. In addition, the probe now reports results in JSON. Expect the traceroute output to be completely different. The are a number of small changes. For example, the DHCP client now sets the client-id and vendor class. Please note that if you have given the probe a static IPv4 address through DHCP and the probes stops working then this may be caused by the change in DHCP client-id.