300 Soul Boxes will be given out through lucky draw on each day of event, which means the one currently in Akibahara (February 6th and 7th) and another one in Osaka (February 11th). So, a total of 900 lucky visitors to Tamashii Feature Vol. 1 will get to experience Tamashii Nation's experimental new packages.
S.H. Figuarts Kamen Rider Kuuga as shown in the image is of course not included.
Also, the customized label for the box can be downloaded from the questionnaire section between February 12th and 28th.
From the naming of the item, it seems that Tamashii Nation is planning to have Soul Box released as accessories for S.H. Figuarts and Robot Damashii figures, instead of using them to replace the current packaging. Different sizes may be planned in the future since everyone comes in different sizes.
It's certainly a bonus for fans of S.H. Figuarts and Robot Damashii, but for others who only purchase certain characters, they would probably keep the original packages or probably have their own alternative methods to store the figures.
Images and information are from Tamashii Web.