If the ships are the lynchpin of the army, then the arkanauts are also the lynchpin, given they man those ships - logically, they go together, and it wouldn't be thematic to field ships without their crew. I'd rather like to see new heroes that would enhance units and ships (an arkanaut lieutenant or an artillery officer for example). Also some new units: mechanical birds (a bigger versions of the thunderer's Drillbill) as a cheap screen and a fast objective taker and a melee oriented version of thunderers, with some staying power. And a Khrundhal-class battleship...