I personally don't like the covers that much. I like the sky background, but everything else just looks like it usually does... The limited A looks pretty bad though, like it's too crowded and they just bunched their pics together. The best cover is probably the single V because it looks more organized I guess. Sorta reminds me of the beginning to the Osaka Koi no Uta PV. But it's missing the moon which I think what makes the other covers nice.
I just listened to the song. Sounds like an album song... and not a very good one, maybe I'll like it more from a better quality rip. The few solo lines are pretty nice though, well Miki's and Ai's anyways >_>. I think they need nicer harmonies <_< and less nananana's. I guess it sorta makes a nice sing along song. I have a feeling I'm not gonna like the PV, but they might pull a Namida ga with this one and give it an awesome PV...