LOL, ok. In that interview:
"10 campaigns", "Artic convoys, Mediterranean, US East Coast", etc.
In Neal's interview they say that the campaign starts in September 1939. Mediterranean operations started in September 1941, US East coast operations started in December 1941 and the Arctic convoys started sailing in August 1941, so it's a given that there will be the "classic" campaign stuff in the North Sea and North Atlantic.
Regarding rough seas, maybe (most likely) it won't be as realistic as some people would like, but I'm sure there will be rough seas, can't see why not.
edit: regarding "unlocking" missions, I find that very unlikely. They said that the enemy reacts to your actions, not that you have to react to the enemy. If you go on patrol say around Malta and that you fail utterly and come back home 3 weeks later with 0 ship sunk, then you have influenced nothing and war goes on.
"unlocking" would mean that if you "fail" a given mission, you can't go on, you have to restart like in Supermario. Except that here the missions can last 4/5 real life hours, no way this would happen in SH5, give the devs some credit
