SMBX 2.0 Beta 3 Trailer Not the official one since there might be more stuff to show in the main game... which is usually always the case.

Official Trailer:    • Super Mario Bros. X 2.0  Official Tr...  

Forum Topic Link: http://www.supermariobrosx.org/forums...

For character and enemy specific showcases:
Klonoa:    • Super Mario Bros. X (SMBX) 2.0 Beta 3...  
Juni:    • Super Mario Bros. X (SMBX) 2.0 Beta 3...  
Uncle Broadsword:    • Super Mario Bros. X (SMBX) 2.0 Beta 3...  
Various Enemies:    • Super Mario Bros. X (SMBX) 2.0 Beta 3...  

@Horikawa Otane's YouTube Channel:    / msotane