Not really backing up the original guy who posted those but there's some things I would like to point out.
071225 is obviously 12/25/07. Reason why most people haven't caught onto it and may think it's just something related to the game system is because going by japanese dates, year is first then month then day. It's basically what it is, giving the date on how far the progress of the game is. If this is indeed fake and some kind of hack, it's either made by someone who seriously knows his asian stuff to fool people or is made by some japanese person.
Next is the art direction. IGA has said he wasn't going with pure kiddy anime like DoS, PoR, etc but with darker anime feel. Again, if this is fake, the person making the screens is doing his homework.
Next is the artwork/sprite comparison. People on various sites seem to be nitpicking they're not the same such as the hair color, lack of design on the sprite's clothes compared to the artwork, etc but coming from CV character sprite standards, I see nothing wrong with the comparison. It isn't tack on 100% the same, but it's close enough? Brown vs black hair? I'm sure anyone can edit the hair color to be the exact same if they wanted to fool people. It's almost the same as saying Soma sprite is fake because he has no face while the artwork ingame shows he has a face. Yes the female's clothing could have more detail instead of just plain black, but that's still good enough. The clothing on the arms match. Not like she is wearing long sleeves. Now that may be totally fake.
Since the guy is offering to give out more screens, I asked for ones with more conversations so I can try to pinpoint what the story is about. And no I do not know this guy. He has a thread at gamefaqs PoR board. As for graphical errors, I'm sure Serio can pinpoint them better than any of us.
This may in the end be fake but since there's nothing new about CV these days, I might as well let the guy lead me on.