Its the only naval ability (actually one civ can capture barbarian boats like Germans capture encampent units - but that won't do much for them), so it will help English Civ Players control the Oceans, which will be more important this time around with Ranged Ships firing a good distance in-land. Out-Manourvering your opponents is indeed a good ability, I mean I assume flanking and the like will apply to naval melee attacks (if you ever do one) so England would be better at that, also they can chase down enemy ships even with bigger slower ships thanks to their ability, and they can easily out-run enemy ships when damaged and in need of healing, Suffice to say it will be useful if applied correctly. Not as useful as say having all Naval Ships get +2 range , + 10 ranged strength, and 50% maintanence, but one would be hoping for too much there.
Arabia's UA could also be considered a naval ability for the mid-late game (2x oil). Russia's UA could also be considered a naval ability for the medieval game (2x iron).
With the current amazingly poorly thought out one-way ranged bombardment it looks like the +2 movement might be quite strong though. With the previews we've seen, it is a system of "he who strikes first strikes last" where the only real important factor is bombarding the enemy before he bombards you. That kind of system promotes speed over everything (like the original Galactic Civilizations II before they realized that a "first strike wins" system was beyond stupid and changed it).
