I just fear that our pink fastrunner and purple little biter simply won't get a lot of screen time. In each clip showing the gang on their journey, Ruby and Chomper are absent. I might be terribly wrong here, which I somehow hope, but I assume we will either see them stay in the valley at the beginning while the others leave, have them show their own little backstory maybe, or witness them arrive at the end as some sort of prologue scene to the TV-Series.
Just some food for thought. As I said, might be incorrect, but I have a feeling this will be the case.