Was this released officially as a pre-order track or a separate single?
I think it's a promo single for the soundtrack, so it's available for individual purchase on iTunes. But it won't be sent to radio, have promo, have a video and get full single treatment.
Meh, she sounds congested on this song. And the song also feels very impersonal. Like she's reading the lyrics off a paper as she's singing.
I'm sure Xtina does that... She sings live after all. Some just need a prompter and a sharp memory to beat the lyrics in their heads that's why they can't emote.