Google really wants businesses to use Hangouts for video chat, but the problem is that there are so many different alternatives with different features. Google is trying to get a leg up, by announcing that anyone with a Google account can now enter a video Hangout, regardless of whether or not the user has a Google+ profile. In addition, another big change is that up to 15 Google Apps users can be part of an HD Hangout.
In addition to those two big changes, there are numerous other updates, including additional markets for the Chromebox for meetings hardware, and increased customer support. They are outlined in the source link below.
Source: Google Enterprise Blog