Great forum question!
 
This one is a serious long shot, but I would love to see SA put all their innovative genius toward a shotgun.  I'd like to see Benelli have an "Oh, crap!" moment over a Springfield-Armory shotgun the same way Sig's been having over the Hellcat.  An auto with an extended tactical mag tube, and able to handle ammo interchangeably, from 2-3/4 up to 3-1/2 magnums, without having to make any manual adjustments.  Just load whatever you want, in any order, and it's showtime!  I'm not very enthusiastic about AR-type shotguns with a magazine underneath, so nix that.  Fast cycle rate, super-reliable and accurate... you know, typical Springfield stuff.  Yeah, I know, too much to hope for.  **sigh**  Okay, maybe just a nice little lever gun in, oh I don't know, 45-70 perhaps?  A lever action Springfield Armory rifle.  Wouldn't that be a cool addition to your collection?