For what it's worth, the place still seats about 900 more than the Gershwin, which is where the last non-RCMH Tonys were held in 1999.
I think they will cut back significantly on the seats made available to the general public, as well as the discounted seats that are typically made available to the casts and crews of currently running Broadway shows. But otherwise, I don't think the smaller capacity will have much effect on how the whole shindig is put together.
"No matter how much you want the part, never let 'em see you sweat." -- Old Dry Idea commercial