Cognizant Technology Solutions — Offer letter not released but hr told me next week

I have got a call from HR that I cleared the TR round and she discussed about my compensation and preferred location on Wednesday
Later I received a mail to fill the Candidate information sheet next day and some interview schedule with hr but she told me not to attend the call.
I am afraid what will happen and when I will get offer ?
please help
She was very polite with me and told me that I would get offer this week but haven't received any update