Difference between HD and Full HD is nothing compared SD to HD.
1920x1080 has twice the pixels as 1280x720 that has four times the pixels as 640x480.
I do not care if its 1080p as long as it is 60fps which is important for a racing game and Wii U is already getting a 1080p 60fps racer Fast Racing Neo also since Super Smash Bros U is 1080p 60fps and with countless 1080p shots from Nintendo and Namco is workin on this game then Tekken and Soulcalibur series on Wii U could run at 1080p 60fps... Since SSBU uses same game engine as latest Tekken and Soulcalibur games....