I'd like them to include a futuristic version of every gun.
If you think about it the weapons are gonna have to be really advanced with amazing automatic aiming. The military ought to have some serious weaponry by now and bullets that fly towards the enemy.
There could also be a futuristic bow and arrow where the bow can fly itself. And vehicles will float people will have Vegeta glasses.
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Deep and interesting gameplay and overwhelming amounts of passion and attention to detail. ...Though now that I read the thread it appears we are talking about guns specifically and not general wants. Hmmm. Perhaps rather than simply guns that kill people, some guns that allow us to interact with our environment in different ways. [Edited on 12.30.2012 11:36 PM PST]