Do you use the same card each year? Also when is the sticker going to be mailed out?

Yep, you use the same student card each year. Just place the new sticker on top of the old one.
You will get it sometime at the end of this month.

Hi, I had already asked the Registrar last month and they advised that they are not mailing any more stickers out for the ID cards, but will provide further information re HSR closer to September (may be a different procedure/card/etc). The ID cards will still be valid themselves but won't have stickers on them. It is still a work-in-progress.