All of this. And the return of old IPs

-Nintendo games such as mario, pokemon, zelda, animal crossing, metroid, etc

-New IP's

-Better 3rd party support

-$250-$299 price launch

-4+ hour battery life

If it's price point is below 300$ and of it gets a mainline Pokémon game, then I'll definitely but it.

Not day one, but close to release because I need to know what´s going to happen with the 3DS :/
If 3DS is going to have a successor I won´t buy the Switch u.u
If Switch is definitely a successor for both Wii U and 3DS I will buy it first year :)

Good Mario Kart.

Good 3d Mario.

Good Price Point.

Nintendo games (Zelda, 3D Mario, Pikmin, Retros game....) on 1st place of course! :D

Probably I want buy it on launch because I want to wait few must have games first, probably will buy it when Zelda BotW launches, but new 3D Mario and some other launch games maybe could change my mind and force me to buy it on launch.

Only if they make a good pokemon game similar to nino kuni. Anything other than that is extremely unlikely to convince me to buy it.

A proper Starfox game and maybe a Metroid spinoff with a male main character that's not Samus.

If they have a 4G model for those looking to use it as a portable device, the I will be on board day one.

But it is a portabl gaming device?. It's not a phone/office tool.

Good support and a good price. 'Good price' depends on the level of support, but considering my situation, I won't be getting it any time soon anyway. Anyway, I don't really care too much about other things, I think.