"It's very exciting. We're right in the middle of it. It's totally different than this; it's a very, very stylised version of it, and she's a tricky character," femalefirst.co.uk quoted her as saying.
The "Anna Karenina" cast also includes Jude Law, Matthew Macfadyen, Aaron Johnson and Kelly Macdonald. It is slated for release Sep 7.
But before the movie, the actress will be seen with Steve Carell in "Seeking A Friend For The End Of The World", directed by Lorene Scafaria.
Photos: Priyanka Chopra's family, celebs watch 'Ventilator' at MAMI
Photos: Raveena Tandon, Sohail Khan at Marathi film 'Bhay' music launch
SRK-Gauri anniversary: B-Town stars and their non-filmi better halves
Birthday special: Popular mothers and daughters in Bollywood
Spotted: 'Kaabil' star Hrithik Roshan with dad Rakesh Roshan