There is a small link, on the cavs website, that brings you to information about their home. There is also a link titled 'Great Plains' click on that and it will bring up a small picture of their facility. Maybe it does not come up for you, it did for me.
They are also replacing the old, very uncomfortable, seats with new ones.
There are plans in the works for a new Coliseum/ Arena to be built in a new downtown area that is planned. But that is still in the works and won't happen for several years.