Square Enix released the Vol.3 trailer of the SaGa: Scarlet Grace which release on December 15, 2016 in Japan on PlayStation Vita.
The Vol.3 trailer is a gameplay scenes included video with selected characters while the WebCM video is a simple short promotion one what you can watch only online (it is not a normal TV CM).

The Vol.3 trailer can be found above while if you click here you can watch the webCM video: https://youtu.be/hfTBFm-4Jes