Every update many sellers freak out and predict the End of the eBay World.
So far, the sky has not fallen. Breathe, people. :-) The strong will adapt and survive, the weak shall perish. Nothing different this year.
Keep in mind that in the returns process eBay has put the buyer under the microscope, too. Like Amazon, when eBay gets a squirrely buyer they do take steps to quell them, starting with revoking their Buyer Protection privileges for a period of time and ending with banning them if need be.
For the person asking above, the extended return period starts Nov 1 and they can return up to January 31, so in effect it is possible you'll get a return 90 days after the sale if it happens on November 1.
Note: When eBay implements something like this, the next step is often to make it all year long, so don't be surprised if you see mandatory 90 day returns in the Spring Seller Update next year (at least to gain the TRS Plus status and discounts).
If the buyer abuses the return (sends back something you didn't send him, sends it back with pieces missing) and you have a good track record as a seller, eBay will back you.