Can confirm there is a bug with the Predator, it's Speed is picking the 'max' of what ever the previously selected unit's 'Max' was.
Eg If you put one down select off it, click a Infantry unit and then click back onto the Pred it'll say max is 8.
If you click on a vehicle your gonna see something like 49 as max.
click a plane/heli and you get the normal range.
So I'd say something is bugged big time was fine in 1.5.6