The first preview is still there, it's played directly after the new one. The copy to this first version now is:
"It's being called a breakthrough in the fight against Multiple Sclerosis. Now a new study at the University of Buffalo is looking into a possible cure for the disease. CTV's medical correspondent Avis Favaro weighs in on the study."
Perhaps they're just TV guys. The new preview and copy is much more "striking" than the first one.
"There is only one good, knowledge, and one evil, ignorance." Socrates