Playing the Terrans (+10 speed) on a new game with this beta, I researched sensors and then designed a new ship that replaced the regular sensors on my scouts with survey sensors. Then I upgraded some existing scouts to the new design. The ships kept the same speed that they had before the upgrade (5, which was correct). However, when I later built another of the same design of ship with survey sensors from scratch, it had a speed of 4. For some reason the new ships didn't get the (+10 speed racial bonus). I haven't played a lot with the beta, but so far this has only happened to me when I upgrade to a ship design before I build one from scratch.
I had a similar problem with a previous beta.