I kinda doubt it's the old one since almost the whole month of March and includes the former applicants' changed to IP on the same day, and from the 2015 spreadsheet, Ottawa and New Delhi VO also changed a bunch of people's ecas (from January all the way to May, four months' applications) to IP on October 9th.
Here is the the definition of IP:
Status of your application
IN PROCESS
(A decision has not been made yet.)
Explanation
Application Received by Citizenship and Immigration Canada (CIC) <== so there's no Application received on ecas anymore
We have received your application and will review it in order of receipt. We will send you an acknowledgement letter.
Documentation Verified by CIC
We are reviewing your application to make sure it is complete and that no documents are missing. We will return incomplete applications for resubmission.
An Interview May be Required
We will review the application and decide if an interview is necessary. If so, we will inform you in writing of the date, time and location of the interview.
I guess maybe we can never tell when our cases are actually in process anymore