Stephen Sollitto said via his Twitter page that fans will 's**t themselves' when they hear the LP.
He said: "OMG Fighters!!! When u hear this next CD u r going to Sh_T urselves!!!!!! Seriously.
"U r following the Queen.. Seriously. Line up. U WILL NOT BE DISAPPOINTED FIGHTERS!!!!! (sic)"
Sollitto added: "NON of u r ready for her next ballad. NON!!!"
It was recently suggested that Aguilera was collaborating with Girl Aloud hitmakers Xenomania on the album, which is due out later this year.
Watch the music video for Christina Aguilera's 'Keeps Gettin' Better' below: