Quick summary so far of the common points:
Front section should have a dock for the items we'd plug into the USB. The standard edition has the USB under/near the screen, so that fits nicely. A little something there with padded sides so folks can bump their legs up against it. If it had a lockable cover, I think that would fit some needs for locking space. If the lockable cover was a combo lock, I think that would be ok.
Middle section is where people start to differ quite a bit. Suggestions of everything from garbage cans to inductive heating/cooling chambers. Or both. Plus cupholders. Or just leave blank so I can put my bag there. I want the pop-out cupholders Larry Chanin mentioned as the insulated lid to the inductive heating/cooling chamber below. If I don't want something hot/cold, I'll just pop out the lid (into the frunk with it!) and that'll be a nice spot for my bag/backpack/man purse.
Last section, which bumps up against the existing armrest thing with round holes in it (I dare not call them cupholders -- I think those round holes are for loose change?)... a large middle section could integrate into the armrest. It depends a lot on people's desires with the middle section.
Folks have also asked for 110vac ports. While I don't think this is an easy addon, it has been asked for so duley noted.
clmason mentioned a special accessory thingy... I suppose could be the powered picnic basket kind of thing others described and it integrates into the floor via a socket. Can cover the socket for the non-premium center piece and can have a 110vac adaptor on it as well as a 110vac (or whatever is good for the local user; Euro plugs, etc) way of using the picnic basket away from the car.
Now I just need to find a Yogi Bear meme thing... here is one from the motion picture (what?! there was a movie?)...