Frankly, if were talking EVERYTHING that I would want:
1) 1080p support, HDMI support. Not so much because I'm obsessed with graphics, but because its been shown that third parties are. And they WILL skip the next Nintendo system if it isn't at the same level graphically as the 'most powerful system'. IE: Cafe needs to be equal to or more powerful than the PS3.
2) Upgradable BIOS and DLC. Ever since the GC, I've felt that Nintendo needs to make their hardware adaptable to changes in the future. In the Wii gen, we saw them do this very slightly with games like Animal Crossing and Mario Kart. But where was the options for DLC for Smash Bros or Pokemon? If ANY game this gen needed downloadable patches and upgrades for levels, it was Smash Bros Brawl. Heck, they could have even added additional levels to Mario Galaxy. Which brings me to my next point...
3) Bigger HDD. Now I don't think 320 Gigs is necessary. But even casual fans of the Wii stated the HDD was way too small even just to download WiiWare/VC games. I myself ran into this problem. They should at least add enough to anticipate for current needs plus a little extra space for what they can't anticipate. Maybe 120 GB with the option to upgrade later? You can buy a 120 GB HDD at the store for like $20-$30 bucks. It really shouldn't be a problem anymore. Which brings me to the next point...
4) Game Installation. Nintendo in the past said their major hangup with using disks is loading time. So why didn't the Wii allow for installing games? We all know its because of the added cost of a HDD. But next gen, I don't see how they could get around it. ESPECIALLY if the system uses Blu Ray...I couldn't imagine the lag on a read only game. Or actually I could...look at Ninja Gaiden 2 or MGSIV.
5) Traditional 8-10 button controller. The Wiimote was a nice experiment, but it shouldn't have been the main controller. Heck, I would have been thrilled at just another GC controller with motion support added. And that's what I'm hoping they do with the next console. A standard controller with motion support added. Just put the motion sensor on the side of the controller. Though I am predicting Nintendo is going to come up with a motion controller option that doesn't require a sensor bar, which would allow for any shape and style of controller.
Everything else I want with the system is not hardware related and mostly focuses on third parties actually supporting the system.
Six upcoming games you should look into:
