Looks like the girls are starting to prepare their next album
Q. Heard that Yoo Bin’s voicebox isn’t that good recently. And she still can’t quite rap during live performances.
Yoo Bin: It’s much better now. I really want to perform live as soon as possible so I am practising hard.
Manager: Although she would like to sing live but because we are now preparing for the next album, so from the company’s perspective, it’s better for her to lipsync now.
credits:
http://wondergirls.wordpress.com/200...-it/#more-2101
isn't it great?

I think the next release won't be a single, but the 2nd album (^-^)