-Okay, so the DLC has some story elements to it that advance the plot as opposed to just showing some insight on certain events (Young Xehanort talking with this enigmatic figure (I'm guessing Xigbar? I'm not too familiar with the Japanese VA), Sora attempting to rescue Kairi, and meeting Namine in the Dive to the Heart (not in that order necessarily)). I can also see how Xigbar may have been creating a self-fulfilling prophecy by influencing YX before he became a master of darkness (YX's heart could have travelled into the future to see what became of the worlds, and Xigbar is in a cloak to disguise himself so MX doesn't know he's the one that's the puppet).
-We see some obvious one on one boss battles we get to try again. We also see some team attacks which seems fun for the BSE (Before Sora Enters) i.e. Axel X Roxas X Xion and Aqua X Ventus
-We also get the Oblivion and Oathkeeper Keyblade, which is strange to me, because I was more than convinced that only by obtaining the Proof of Times Past would you be able to obtain the Oblivion Keyblade (given the translations and all) but now it seems that you can get it regardless of beating Critical Mode or not (as Sora's HP is at Proud Mode Max and not Critical Max); it makes me wonder what the "Proofs" are for in the future (who knows, maybe they're nothing? Like the crowns? But that seems unlikely to me). Also, it seems that the Oblivion Keyblade holds some sort of Guardian Form aspects to it, and the Oathkeeper has some Element Form aspects to it as well. I'm sad that they don't change forms though, I think it'd be wicked cool to have a scythe like weapon for Oblivion and a new gun form for Oathkeeper.
-The two things I'm not on is why the Lingering Will is holding the Earthshaker Keyblade as opposed to the Ends of the Earth Keyblade we obviously see him fighting Terranort with before -I feel like there's a story element there, because to me that's like a downgrade for Keyblades-. If the EE Keyblade were being used at the time by another individual, I could understand that, but as far as I'm aware, no one was using it, and two of the same Keyblade CAN exist if they are from different times (i.e. No Name). Also, when does the Roxas + Xion + Axel fight scenario fit in to the whole Saix battle? I highly doubt that's one of the intended 13 boss fights, given from what we just saw from Xigbar and Vanitas.
PS When Chirithy was talking, I initially thought they were talking to Sora, given that he DID go back in time to stop light form expiring, but now I'm seeing people say that Chirithy is most likely speaking to Kairi, who (whether or not it was a joke) is somehow connected to the past...aw fuck
PPS It is now confirmed that Sora is indeed a "Quick Shot" (0:49)...tee hee