I would think the G Pro would not be tri-band since it's an older device.
The rumored Optimus G 2 would be more likely I think.
Edit: Apparently the Optimus LS980 we're getting has a Snapdragon 800 so there might be more changes. They don't mention the screen size, so it could be either one. The original Optimus G was the LS970, but the AT&T G Pro is E980, which has a Snapdragon 600. Strange.