I am already impressed with what Nintendo has done with the Switch. Even though there have been many other gaming tablets on the market, none of them are truly a "gaming" tablet. Do any of those have PHYSICAL games? No. The Switch IS a real gaming tablet.
I will only list one thing that will blow my mind.

The more expensive sku will be another dock, but with actual processers inside it to boost home mode to current gen standards.

1. Vanquish 2
2. A new IP like Splatoon
3. 199$-299$ pricepoint
4. Decent battery life
5. Retro Studios game

1. Region free
2. Good battery life
3. Pokemon
4. Decent launch year line up
5. Mario at launch I guess

What would wow me?

1) Virtual console that supports NeoGeo, Saturn, Dreamcast, TGX16, etc.
2) A From Software exclusive
3) Region-free
4) $199 with no online paywalls
5) Battery life that would survive a cross-country flight (that's USA, not Luxembourg)

What would satisfy me?

1) A robust Virtual Console AT LAUNCH
2) $249 with no online paywalls
3) Big launch line-up with heavy output through at least summer 2018
4) New installments of Metroid, Pilotwings, F-Zero, i.e., stuff that's been collecting dust
5) Significant "AA" Japanese support, e.g., Platinum, Bandai, Chunsoft, Atlus, etc.

Region Free + long battery life + at least 10 upcoming AA-AAA games from 1st and 3rd party developers

1-200$
2-large batery life
3-handheld games(monster hunter, mainline pokemon, fire emblem, japanese vita games, etc.we havent seen any)
4-GTA/RD2
5-gyro/acelerometer on con controllers

Lots of non-Nintendo games
Region free

1- Zelda and that one is coming
2- Price I can pay at launch
3- new Xenoblade
Hey I know I am getting this cos it's great as always

1. PRICE! So important
2. Games especially 3rd Party games
3. Specs
4. Battery Life
5. Region Locked?

1. A version will be available in which the mobile unit has 4G and/or text and call support.

2. It runs on a Nintendo proprietary OS.

3. They are working with devs to bring ios and android games and apps to the eShop.

4. They will get most major 3rd party games tbat come to PS4, XBO, and PC.

5. Nintendo will be fully vested in development for the platform.