At about 0:29 into the movie, you can see a glimpse of Werehog being startled by the ghosts, even though Sonic hasn't transformed yet! (blogs.sega.com)
Slow bulky brawly werehog levels make up the bulk of the experience and they take longer to complete than the daylight stages, making the superior day stages feel like a tease. (pressthebuttons.com)
Hashimoto also took the time out to elaborate a bit more on the newly introduced werehog Sonic; while in this form, the Blue Blur will lose some of his trademark speed but gains some strength, letting him toss enemies and objects around like nothing. (thatvideogameblog.com)