That's a lot of releases for one single if it turns out to be true.
You'd only expect DVD Audio for an album? I wasn't even aware Avex used the SACD format? I don't think they even have before.
Very unusual.
Will keep an eye out at TeamAyu to see if any news pops up.
**EDIT**
I just put that catalogue number into google japan, and I come up with a Japanese BBS with a rumour of another Ayu cd. So that catalogue number has been used before in another rumour.
Apparently, a CD called ' A Summer Songs' was supposed to be released like 2 weeks ago with that catalogue number
But I guess we will never know untill we get some more info. Who knows. There might be a new single.