He revealed to MTV: "I can tell you there's some dance stuff, there's some slow, more introspective stuff and some club tracks. She even raps a bit. Talk rap."
He added: "When she gets behind the microphone there's a magic that comes out - and the music that we're doing is the next level."
Rotem - who has previously worked with Destiny's Child and 50 Cent - also says Britney sees music as "a challenge" and always wants to better what she has done before.
He explained: "Our goal is to try to one-up the earlier stuff. How can we innovate? How can we make the type of music where the people are gonna go, 'Whoa, what's that?'"
He added: "I was blown away to see Britney record in the studio.
"You hear this finished result that sounds professional, but you don't know how much of it is overproduced, how much of it is edited.
"But I found the actual talent was really there. So I definitely gained some respect for her."
Last week, Britney gave birth to her second son, Sutton Pierce. She already has one son, Sean Preston, with husband Kevin, who is currently trying to launch himself as a rapper.
The 'Toxic' singer delivered her second son at the Cedars-Sinai Medical Center, in Los Angeles, just before 2am on Tuesday (12.09.06)
According to gossip web site perezhilton.com, Britney named the tot - who weighed in at a healthy 6lb 11oz - Sutton Pierce Federline so he has the same initials as his older brother Sean Preston Federline .
The boys also (almost) share a birthday – Sean Preston turned 1 on Thursday, just two days after his brother was born.
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