Hi Susan
ESA is an indefinite award with scheduled reassessment based on the Prognosis Date completed by the assessor in their report, so your existing ESA award continues in payment until a new Decision is made.
The only way of finding out is to contact the DWP and ask.
Not aware of your condition or what supporting documents you sent in with your claim so we cannot say if you will have a paper review or a telephone assessment.
Our ESA/UC Claim guide has a section on the questions you are likely to be asked during the call.
www.benefitsandwork.co.uk/help-for-claimants/esa1 If you have any further questions please come back to the forum.
Gary