Now I have been thinking, what features would this series gain from a second screen, well I can think of a few.
1: Map on the bottom screen (This would work in almost every game but this game had me switching between the map screen a lot)
2: The special abilities on the bottom screen for easier access.
3: Mech status, this is kinda vague so allow me to elaborate. Have a type of wire frame figure of your mech that would have your mech's current condition.
4: Some sort of multiplayer, okay i know, it doesn't have much to do with the Wii U itself but, i just want to go online to do a mech deathmatch of some sort.

These are all that I can think of right now, but let me know what you think would be cool. And if you haven't played these games then you can buy the first for $3 (but it is really hard to find) and the second for about $10. There is also a HD collection coming out later this year for the Xbox 360 and PS3. I strongly recommend you do.