Yes, Disney Plus does feature ads. Ads will be shown to users on the basic subscription tier. The ad-funded basic tier will cost $7.99 USD per month, while the ad-free premium tier will cost $10.99 USD per month. This premium tier will be rolled out in the US only.
It has not yet confirmed the rolling out of ad-supported subscriptions in Canada, so for now, users in Canada can enjoy their content without worrying about ads.