I'm excited, but trying to not expect too much with their WiiU software reveal.
Nintendo is generally pretty conservative with their software reveals, tending to only show games that are coming out in the near future. That would essentially rule out a 3D Mario, Smash Bros. and Zelda from the outset, since we already have a 2D Mario for the system, Smash won't come out for years and Zelda only came out last year for Wii. You can probably count out Kid Icarus too.
Then there's all its other IPs. We might see Kirby, but that itself has received three entries in the past two years. Metroid hasn't been able to maintain its popularity since its revival in 2002. F-Zero is virtually dead in the water. Same goes for Mother.
Which means I can really only be confident about a few franchises being shown off. Namely Pikmin, 2D Mario, Donkey Kong, Animal Crossing and maybe Mario Kart. Which isn't bad at all, but it wouldn't be OMG huge.
Hence why I'm really hoping for some surprises, whether that be new IPs or dead franchise revivals (ie F-Zero).