[Z]

I don't know, but I don't think so. It seems like Sugababes 4.0's fate rests entirely upon their endeavours in the coming months - Heidi on Dancing On Ice, Amelle apparently releasing some solo material and Jade apparently close to clinching a presenting job on The Voice in some capacity. Apparently they will be staying together as a group and, depending on well they fare, that'll decide the fate of their musical career. I imagine that, by the time all of that has played out, the original line up will be just about ready to release some music, so in all likelihood the issue of their name might not even be an issue if the 4.0 line up cease to exist.