The 3D coral background, to be added to a future version of the saltwater Aquarium will be two full monitor-widths wide.
On a single display or a widescreen display, the "camera" will slowly pan back and forth to exhibit the whole width of the tank.
You'll also be able to lock the camera if you wish.
Jim has suggested that due to the larger tank size, we'd be able to have 10 fish at once, plus 3 or more invertebrates. So maybe some day we'll have 10 fish, a Zebra Moray Eel hiding out in the shadows, a coral shrimp crawling around, the starfish crawling on the gravel or even on the coral too, not to mention a snail on the glass.
The 3D coral background is being designed with forethought into where an Octopus, Eels, etc. would hide. There will be alcoves, etc.
We've had quite a few topics on the 3D background in the past, I'm only recapping info from fall of last year. I know we'll have more than 2 lights in the tank to adjust. And we may get more advanced lighting controls possibly with timers.
To my knowledge, we will not be able to have the entire aquarium tank "letterboxed", but maybe if we bug Jim about it enough.
I'm assuming if we do windowed mode, we'll be able to choose 4:3 windowed or 8:3 windowed mode.
Also, there were a few requests about whether we'd be able to swing the camera around the other side of the Aquarium. Well, Jim has no plans to texture or model both sides of the tank! So we'll be seeing just one side, as we are now.