Instead only seeing your own opportunities or opportunities for people in your team you now have the option to define exactly who can see which opportunities by assigning permissions to each opportunity. Click on the share toolbar button for an opened opportunity to bring a popup screen where you can define who has access to the opportunity (me, my company, all) and list individual people together with their access level (read, update, admin). We also enhanced the permissions pop-up across the system to allow both the person who created an object as well as the person responsible for that object to edit permissions of other users