Obviously Final Fantasy 3 and 4 on mobile and PC will remain considering they were rebranded with the 3D Remake text in the name and logo. At the time, there was no news about how these games will be released and whether they will be updates or new purchases and whether the old versions will be delisted.
The video was made private soon after it went live but it showcased many of the games included in the Final Fantasy Pixel Remaster series. Yesterday, an extended look at the Final Fantasy Pixel Remaster series confirmed that the games will launch individually on mobile and PC beginning next month.