Ultra Street Fighter II isn’t just another port of the iconic Street Fighter II but also contains a special new mode. Taking advantage of the Joy Con controllers, a first person mode is going to be included in the game and it finally got explained recently due to box art being released.

First, it’s now officially confirmed that Ultra Street Fighter II will have a new first-person mode. This was originally teased in the game’s debut trailer last month. It’s a unique game mode called “Unleash! Ha”DO”ken”, and is specialized for use with the Joy-Con controllers in a first-person view.
To further explain the name, “hadoken” is 波動拳 in Japanese. For this mode, Capcom has removed the 動 and replaced it with “Do”, making it 波Do拳. We don’t know how the mode’s name will be handled in the English version, but it’s almost like a neat little play on words.
A screenshot on the box has a timer and seems to show multiple Shadaloo Soldiers. This is speculation, but perhaps it’s a mode in which you hold the Joy-Con and literally shoot hadoken, sort of like a rail shooter.

As Nintendo Everything stated, it seems that you will be using Hadoken attacks to fend off soldiers using motion controls, which is a nice way to take advantage of the Switch’s unique features while not distracting from the main package (2D brawling combat). You can read more about the art collection that will be within the game and my by reading the original story from Nintendo Everything.