Notice that Luffy, Chopper, and Robin (WOOT!) are the only ones on the colorspread?
Anyway, it sure is a surprise to see Garp being Luff's grandfather. I don't think Garp would be cruel enough to arrest his own grandson. Remember Garp said he only came here because he wants Luffy to meet two of his men, and we know who they are already.
Can't wait to see those 2 next chapter!
And LOL at Luffy's ability to eat and sleep at the same time!