Wow, they really nailed Grimlock's voi--PURPLE GALVATRON?! GIMMIE GIMMIE GIMMIE!! You can see purple Galvy building the larger, silver Galvy. By standing on a Vehicon's head, no less: Who's that?
Maybe purple Galvatron is a teaser that he'll change colors in the movie when he becomes a decepticon or least I hope so.
Galvatron's factory battle? Lil spoiler there? XD Do wonder if we will get to see the place where the humans build their tfs. ^^