I just happened to log onto the
DeGroote school of business website and found that it does mention of taking CAT scores... (not clear whether only CAT scores would do or they still need GMAT)... but it certainly is a giant leap for IIM's CAT
Here is the link.
Information for International Applicants
Only students who have a bachelor's or comparable degree may be considered for admission to the MBA Program. Due to variations in the educational systems throughout the world, a bachelor's degree from a foreign country does not automatically mean that the foreign student will be granted admission to the Program. Foreign students should normally expect to spend at least two complete academic years at McMaster in order to qualify for the MBA degree.
Applicants from India may wish to provide their CAT registration number and test date on the application form.
A further qualification for Visa students is that they
must have a minimum of one year of technical, managerial or professional work experience.