Comments about Roger possibly being Im are interesting. While I won't throw my hat in with them, it does bring up a couple instances throughout the manga where I wondered if Roger was actually alive somewhere. The most recent was Momo mentioning that he met Roger and his crew at one point, which seemed strange considering Roger should have died well before Momo's birth. The other was before Whitebeard's death, when he said that Roger was waiting for someone. I may have interpreted these scenes incorrectly, but I remembered thinking that they seemed to be implying that Roger may still be alive.
As for the chapter itself, it was great seeing Bonney again. I wasn't expecting her to appear so soon, so that was a pleasant surprise. Not so pleasant was seeing what happened to Kuma...
If Bonney really is from the same kingdom as Kuma, and it wasn't just a ruse to get in, I wonder what their relationship is. Maybe we'll finally get some info on why Akainu was after her.