Bringing the game to the modern PC promises cool new features. I can't wait to take on the GD community in head-to-head network play :) It'll be possible to have lots of little non-linear animations to give the ships, cannon, and castle walls a touch of increased realism. The PC's power will allow smarter opponents in solo play, and much larger maps, though I'm not certain that larger maps would make it any more fun.
I definetly want gold to be involved. I think cannon, castle walls, and (I'm adding) towers will cost money to construct, and maybe even firing the cannons will have a small cost as long it doesn't detract from the fun of demolishing your opponent.
Look forward to an alpha version of Cannon Siege, coming next July from The Holmlor.