I agree with that. I think most people simply think that CA shouldn't invest too much effort in the naval battles in the first game, since they would only be secondary given the map we will be playing in. I think people would prefer awesome magic mechanics and flying creatures in the first game, and ultimately develop the naval battles further in a future game when the Dark Elves and High Elves are introduced.
So personnally, I expect something like this for TW Warhammer's naval battles: A blend of the battle mechanics we had in previous games, with re-skinned units. The Empire's navy would behave like ships of the line in ETW, the dwarves would get metal-hulled steamships with ramming abilities, other factions like the greenskins would be centered around boarding actions and archer ships.
Nothing special, nothing too innovative, simply something that works and looks good for now. When we start fighting for Ulthuan and Lustria, I will start to expect some truly epic game-changing naval battles.