Google have finally opened the flood gates to Google+ to business and brands, not just individuals. The new feature is being called "Google+ Pages", and there seems to be little different between a Page and an individual account.
You're able to add Pages to any of your regular Circles, and Page owners are able to post as usual and take part in Hangouts. Pages also turn up in Google search results, which is quite handy. Google have also introduced a new Direct Connect as well that allows you to specifically search for Google+ Pages, to do this type "+Google" or "+Angry Birds" in a Google Search box and you'll be directed to the respective page.
Both features rollout on a limited basis starting today with Google promising everyone will have it soon.