Possible Wonder Weapons?

Right, so with the preview we can infer that mega bombers and Land Battleships are likely to be things you can get... But what would other fun super weapons be?

It'd be kinda hilarious if some of them were things like the proximity fuse, which increased the effectiveness of allied anti-air and artillery almost tenfold due to removing the guesswork from programming flak shells, and allowing airburst artilleryshells. Or the targeting computers built into the turrets of later allied bombers