If they can echo the DS, in terms of sheer volume of titles, and both new and classic game concepts wrapped together (like how the DS is getting possibly the best version of Castlevania ever, and we're getting a normal Mario Kart with online play, but games like Kirby DS and Ouendan can be enjoyed on the system as well), I will be very happy.
I just wish they weren't so afraid/hesitant to add the nice eye and ear candy to their games when they seem to have the chances. A few times Nintendo-made Gamecube games looked quite good (Pikmin 2 and Melee spring to mind), but many others seem like they could've done better (Mario Kart, Sunshine to name two). And MK and Sunshine were both big-name titles with a lot of expectations. Also, when a game designed for budget release like We Love Katamari can still foot the bill for orchestrated music, I start to wonder why Nintendo doesn't do so more often. What was there in Melee sounded fantastic. But it's nice to know that there's some nice orchestrated work in Twilight Princess, in addition to the excellent Kondo work as well, so that's a good step in that direction.
As long as they don't overprice the game downloads on the Revolution (I really don't want to be paying significantly more for one game versus another on the same console because it's a Mario game, or Kirby or what have you), I think that'll go over well, too.
The DS WiFi stuff is looking good, just a tad annoyed they were slow getting started with it, but this is absolutely better than nothing (and I love what games they picked to start it off with, Mario Kart and Animal Crossing). I don't like that their current stance towards voice chat seems to be "since we can't monitor it, they shouldn't have it," since that'll cripple some online games and make both the mic and headset jacks a bit useless. Hopefully they'll change that stance, or not force it on third parties. WiFi takes it out of the hardware anyway, though, so that's probably another good reason why they're not in a rush to implement voice chat as well.
I'm positive, especially since a ton of DS games have just been revealed today. If they can ride this wave and bring that same crowd onto the Revolution, things will be very interesting indeed.