I had a look at the video and yeah it doesn't look great. For reasons unknown, Sega don't seem to be able (or want) to pull Sonic out of 90's gameplay mechanics. It just looks so dated and it's not even out yet.
PREDICTIONS FOR END OF 2015: (Made Jan 1st 2015)
PS4 - 34M - XB1 - 21m - WII U -12M